This is such a neat device. It was able to show the EMF coming from my microwave and even my router. It's pretty neat and although I have no idea what I plan on doing with any of this knowledge, it does work.
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Electromagnetic Field Radio Frequency DetectorFINRSI Technology
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FNIRSI ERD-10 EMF Detector, 4 in 1 EMF Radiation Meter with Curve Mode, Rechargeable EMF Reader Electromagnetic Field Radio Frequency Detector for Home, Office, Ghost Hunting
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Purchase options and add-ons
- 【EMF & Temperature Detector】4IN1 multifunctional meter for radiofrequency fields, electric fields and magnetic fields. Comprehensive monitoring to protect your health.
- 【Curve Mode & Accurate Measurement】High-sensitivity sensors provide real-time, precise readings with curve display for clear tracking of radiation trends.
- 【Day and Night Theme Display】Features black and white theme switching. Enjoy clear visibility under sunlight and the values can be read clearly even in the dark.
- 【Visual, Audible & Vibration Alarm】3 Types of Alarms keeping you informed and allowing timely protective action.
- 【Portable & Rechargeable】Rechargeable design makes it easy to carry. Ideal for detecting EMF from home inspections, workplace safety, and even paranormal investigations.
- 【Wide Applications】RF mode can detect WiFi signals, 5G signals (below 3.5GHz), microwave oven. EF and MF modes can detect television, refrigerator, computer, and power line.
Product details
- Batteries : 1 Lithium Polymer batteries required. (included)
- Parcel Dimensions : 20.6 x 9.9 x 4.7 cm; 250 g
- Date First Available : April 16 2025
- Manufacturer : FNIRSI
- Place of Business : FNIRSI
- ASIN : B0F547M1NZ
- Manufacturer reference : ERD-10
- 鶹 Rank: #16,769 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #25 in EMF Meters
- Customer Reviews:
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5 out of 5 stars
Competitive detector that satisfies curiosity
This FNIRSI ERD-10 field detector is built like a professional multimeter. It has four fabric feet on the back (to stick to a hook-and-loop strip already on a work surface), a thick silicone bumper around the perimeter, four silicone buttons, and a high-resolution color display. For a modern touch, the device has a USB C port for recharging. This product looks right at home on an engineering workbench. The unit can show four instantaneous numbers on its default screen: temperature, magnetic field intensity, electromagnetic field intensity, and radiation power (for radio frequencies). An alternate screen omits radiation in favor of a history graph for either the EM or magnetic field; temperature is present again as just a number. The default screen scores EM and magnetic readings with up to eight bar segments, but the device never labels the vertical axis, much less the frequencies or direction of signals. The product has a Hold button which freezes all the numbers on the default screen. The second screen, with a constantly changing baseline, peaks and plateaus from the last 45 seconds, presents data in two dimensions. Despite the more informed analysis possible, that screen can not be frozen and the time axis is not labelled. The detector includes a temperature readout on its default screen and history screen. The temperature is not graphed, so you just see the current value or last value when Hold was pressed. Not a field measurement, this is the most basic of all the data the device displays. Magnetic field detection is rightfully zero in my home except when I place the unit close to AC transformers (found in wall power adapters and embedded power supplies), electric motors, and an operating microwave. Not surprisingly, the microwave yielded numbers (up to 30 microTeslas) that were over a thousand times higher than the minimum reading for weaker sources, at a distance roughly 10 cm away. Permanent magnets waved just millimetres away from the device also caused significant readings. Electric field numbers in open areas of my home are typically 0-15 V/m. When the device is 10 cm or closer to active electrical cords, wires in the wall for lights switched on, full-size LED light bulbs, or large appliances, numbers ranged from 20 to 140 V/m. I also noticed EM fields near dormant TV screens, dormant PC monitors (not all), and USB webcams. So the detector is definitely sensitive to EM from 60 Hz household AC, and maybe other internal frequencies in electronics. EM field readings rapidly fell to quiescent base levels when the distance from a source approached and exceeded 30 cm. Many spots in my home show radiation power at 0.025 microwatts per square cm. When I pushed Talk on an FRS walkie-talkie 10 cm away, the power jumped by over a hundred times. When an Android phone scanned for Bluetooth devices, a similar leap in radiation power occurred. Browsing by 2.4 GHz on the phone had a strong effect too, as did activity using LTE cellular. A dual-band wi-fi router 1 m away registered 0.800 microwatts per sq. cm. A 78mm halogen light tube almost touching the detector also produced a reading. Interestingly, a 5 GHz wi-fi connection on the phone did not elicit a radiation rise on the meter. The sources that caused radiation increases utilize frequency bands from about 400 Mhz to 2.6 GHz. The detector not responding to 5 GHz signals is disappointing. At least it can sense low frequency RF convincingly at 1 m and very dramatically at closer proximity. Radio frequencies are just EM fields within certain common bands modulated for communication. This field detector shows general EM values in big numbers and a graph, but relegates RF (radiation power) to a simple number on the default screen. A graph for RF would have been beneficial since home and office environments now abound with data transmissions. If you have walked past an FM radio or tried holding rabbit ear TV antennas in your hands, you will know the human body blocks, reflects, or conveys EM waves depending on the frequency. As a result, RF and especially EM numbers fluctuate constantly when my fingers are around the middle of the instrument. I find the most steady readings are achieved when I put the device on a table. When I want measurements near an appliance or specific point, grasping the unit with just a couple fingers at the bottom end reduces bodily interference. The manufacturer should have included labels to encourage holding the bottom. To their credit, they did include a wide plastic loop at the bottom for attaching a wrist strap. Using a strap will not really avoid EM and RF interference, but it makes carrying the device a bit easier. The audible alarms for EM and magnetic fields are quite distracting when numbers briefly and repeatedly go above and below the thresholds. I found silencing the instrument preserves sanity. You can still set thresholds to make the power button flash red, which is nicer than frequent beeping. I am sure checking industrial machinery, vehicles, and cell towers with this detector would be eye-opening. At home, this detector will tell you if you are near moving magnets, microwaves, powered electronics, active wires, transformers, walkie-talkies, 2.4 GHz wi-fi equipment, LTE cellular phones, and gadgets generating various EM, RF, and magnetic fields. When this instrument is touching or extremely close to those devices, it may sense multiple types of fields, and fewer will be detected as you move away. This instrument is both simple and confusing to read, so knowledge is definitely required to interpret the results. At the same time, the lack of frequency measurement, axis labelling, RF graphing, and other omissions prevent this product from being an engineering tool despite appearances. Even so, this product is competitive with other products in its price class. In the end, it provides enough insight to satisfy my curiosity about field safety and nominal operations for equipment.
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Top reviews from Canada
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- Reviewed in Canada on July 13, 2025
- Reviewed in Canada on June 13, 2025The device has only two screens, one showing the instantaneous view for EF, MF and RF readings, and another with historical data, but only for Electric Field and Magnetic Field readings which can be switched, so no simultaneous or overlapping views of the historical data. There is no history view of the Radio Frequency readings unfortunately.
The manuals can be found online. You'll have to hunt them down yourself though since 鶹 does not allow external links to be posted.
I've also had to filter this review. 鶹 community guidelines aren't very useful when they reject your review. It would be nice if their filter mechanism would at least underline or highlight the portions of your review so you know what it doesn't like so that you can strip it out. I'm assuming it's the external links I had included to the manuals, but not sure what else it didn't like so I stripped out a whole bunch of stuff.
As of the moment of writing this, there are no firmware updates for this product.
The unit I received came fully charged, so it was ready for using out of the box.
The readings were rather interesting, I was able to trace wiring behind walls quite easily.
With this meter I can tell when the Wi-Fi is in use. I also tested it by the microwave and you can see the difference in readings when it's in use.
The MF readings can be used to test things like transformers, typically found in wall warts. Even when plugged in and not in use, they generate a magnetic field. So you can always use this meter to test them to see if your transformer is dead or not.
The only bad thing about this is that the temperature sensor isn't particularly useful. If you hold the unit like a cell phone, the temperature reading just keeps rising until you're no longer warming it up. For me, that was 30°C, so it made the temperature reading rather useless. It only works when you place it on a surface. I tried holding it like a stud finder, and although it didn't raise the temperature as much, my hands still increased the temperature reading, so it's rather sensitive.
I wish there was a setting to disable the alarm altogether. The only way to do so is to crank the settings up so high that it won't trigger the alarm. You can turn off the volume too if you want to, and that's the first thing I did once I realized I could do that.
Charging, when plugged in to charge, what you get is an image of a battery with a green fill bar that slowly fills up the battery and continues to cycle. The power on light also lights up red when charging. You cannot use the unit when charging and if you try to turn it on, it'll remind you of that fact.
Otherwise, I'm rather pleased with this. I'm really glad I go it. It's made me discover new things about the EFs around me.
- Reviewed in Canada on July 12, 2025The instrument displays electric field, magnetic field, temperature, and radiation power on the main screen.
Pressing the left arrow or settings button shows options to set the volume, brightness, language, style (interior or exterior mode), and reset to factory defaults. Use the right button to jump to the next setting, and OK button to choose.
Pressing the Model button adds a graphic display showing momentary change in the electric field. Press the right button to see the graph for the momentary change in the magnetic field.
The intensity level limit of the electrical and the magnetic field can be adjusted. The magnetic field unit of display can be chosen. Four options of automatic shut down time are available, including one that would keep the unit ON.
The display changes from white to red when the electric and magnetic fields are detected.
Electrical fields are detected more easily. We will check the magnetic field against the magnetos of small engines that produce the 30-40,000 volts for the engine spark - will update here. Will also check this tool with non-sparking magnetos and update here.
The temperature reading stabilized in a few minutes and stayed there after a location change from one room to another.
This appears to be a basic level tool with four sensors.
- Reviewed in Canada on June 13, 2025This FNIRSI ERD-10 field detector is built like a professional multimeter. It has four fabric feet on the back (to stick to a hook-and-loop strip already on a work surface), a thick silicone bumper around the perimeter, four silicone buttons, and a high-resolution color display. For a modern touch, the device has a USB C port for recharging. This product looks right at home on an engineering workbench.
The unit can show four instantaneous numbers on its default screen: temperature, magnetic field intensity, electromagnetic field intensity, and radiation power (for radio frequencies). An alternate screen omits radiation in favor of a history graph for either the EM or magnetic field; temperature is present again as just a number. The default screen scores EM and magnetic readings with up to eight bar segments, but the device never labels the vertical axis, much less the frequencies or direction of signals.
The product has a Hold button which freezes all the numbers on the default screen. The second screen, with a constantly changing baseline, peaks and plateaus from the last 45 seconds, presents data in two dimensions. Despite the more informed analysis possible, that screen can not be frozen and the time axis is not labelled.
The detector includes a temperature readout on its default screen and history screen. The temperature is not graphed, so you just see the current value or last value when Hold was pressed. Not a field measurement, this is the most basic of all the data the device displays.
Magnetic field detection is rightfully zero in my home except when I place the unit close to AC transformers (found in wall power adapters and embedded power supplies), electric motors, and an operating microwave. Not surprisingly, the microwave yielded numbers (up to 30 microTeslas) that were over a thousand times higher than the minimum reading for weaker sources, at a distance roughly 10 cm away. Permanent magnets waved just millimetres away from the device also caused significant readings.
Electric field numbers in open areas of my home are typically 0-15 V/m. When the device is 10 cm or closer to active electrical cords, wires in the wall for lights switched on, full-size LED light bulbs, or large appliances, numbers ranged from 20 to 140 V/m. I also noticed EM fields near dormant TV screens, dormant PC monitors (not all), and USB webcams. So the detector is definitely sensitive to EM from 60 Hz household AC, and maybe other internal frequencies in electronics.
EM field readings rapidly fell to quiescent base levels when the distance from a source approached and exceeded 30 cm.
Many spots in my home show radiation power at 0.025 microwatts per square cm. When I pushed Talk on an FRS walkie-talkie 10 cm away, the power jumped by over a hundred times. When an Android phone scanned for Bluetooth devices, a similar leap in radiation power occurred. Browsing by 2.4 GHz on the phone had a strong effect too, as did activity using LTE cellular. A dual-band wi-fi router 1 m away registered 0.800 microwatts per sq. cm. A 78mm halogen light tube almost touching the detector also produced a reading. Interestingly, a 5 GHz wi-fi connection on the phone did not elicit a radiation rise on the meter. The sources that caused radiation increases utilize frequency bands from about 400 Mhz to 2.6 GHz.
The detector not responding to 5 GHz signals is disappointing. At least it can sense low frequency RF convincingly at 1 m and very dramatically at closer proximity.
Radio frequencies are just EM fields within certain common bands modulated for communication. This field detector shows general EM values in big numbers and a graph, but relegates RF (radiation power) to a simple number on the default screen. A graph for RF would have been beneficial since home and office environments now abound with data transmissions.
If you have walked past an FM radio or tried holding rabbit ear TV antennas in your hands, you will know the human body blocks, reflects, or conveys EM waves depending on the frequency. As a result, RF and especially EM numbers fluctuate constantly when my fingers are around the middle of the instrument. I find the most steady readings are achieved when I put the device on a table. When I want measurements near an appliance or specific point, grasping the unit with just a couple fingers at the bottom end reduces bodily interference.
The manufacturer should have included labels to encourage holding the bottom. To their credit, they did include a wide plastic loop at the bottom for attaching a wrist strap. Using a strap will not really avoid EM and RF interference, but it makes carrying the device a bit easier.
The audible alarms for EM and magnetic fields are quite distracting when numbers briefly and repeatedly go above and below the thresholds. I found silencing the instrument preserves sanity. You can still set thresholds to make the power button flash red, which is nicer than frequent beeping.
I am sure checking industrial machinery, vehicles, and cell towers with this detector would be eye-opening. At home, this detector will tell you if you are near moving magnets, microwaves, powered electronics, active wires, transformers, walkie-talkies, 2.4 GHz wi-fi equipment, LTE cellular phones, and gadgets generating various EM, RF, and magnetic fields. When this instrument is touching or extremely close to those devices, it may sense multiple types of fields, and fewer will be detected as you move away. This instrument is both simple and confusing to read, so knowledge is definitely required to interpret the results. At the same time, the lack of frequency measurement, axis labelling, RF graphing, and other omissions prevent this product from being an engineering tool despite appearances. Even so, this product is competitive with other products in its price class. In the end, it provides enough insight to satisfy my curiosity about field safety and nominal operations for equipment.
5.0 out of 5 starsThis FNIRSI ERD-10 field detector is built like a professional multimeter. It has four fabric feet on the back (to stick to a hook-and-loop strip already on a work surface), a thick silicone bumper around the perimeter, four silicone buttons, and a high-resolution color display. For a modern touch, the device has a USB C port for recharging. This product looks right at home on an engineering workbench.Competitive detector that satisfies curiosity
Reviewed in Canada on June 13, 2025
The unit can show four instantaneous numbers on its default screen: temperature, magnetic field intensity, electromagnetic field intensity, and radiation power (for radio frequencies). An alternate screen omits radiation in favor of a history graph for either the EM or magnetic field; temperature is present again as just a number. The default screen scores EM and magnetic readings with up to eight bar segments, but the device never labels the vertical axis, much less the frequencies or direction of signals.
The product has a Hold button which freezes all the numbers on the default screen. The second screen, with a constantly changing baseline, peaks and plateaus from the last 45 seconds, presents data in two dimensions. Despite the more informed analysis possible, that screen can not be frozen and the time axis is not labelled.
The detector includes a temperature readout on its default screen and history screen. The temperature is not graphed, so you just see the current value or last value when Hold was pressed. Not a field measurement, this is the most basic of all the data the device displays.
Magnetic field detection is rightfully zero in my home except when I place the unit close to AC transformers (found in wall power adapters and embedded power supplies), electric motors, and an operating microwave. Not surprisingly, the microwave yielded numbers (up to 30 microTeslas) that were over a thousand times higher than the minimum reading for weaker sources, at a distance roughly 10 cm away. Permanent magnets waved just millimetres away from the device also caused significant readings.
Electric field numbers in open areas of my home are typically 0-15 V/m. When the device is 10 cm or closer to active electrical cords, wires in the wall for lights switched on, full-size LED light bulbs, or large appliances, numbers ranged from 20 to 140 V/m. I also noticed EM fields near dormant TV screens, dormant PC monitors (not all), and USB webcams. So the detector is definitely sensitive to EM from 60 Hz household AC, and maybe other internal frequencies in electronics.
EM field readings rapidly fell to quiescent base levels when the distance from a source approached and exceeded 30 cm.
Many spots in my home show radiation power at 0.025 microwatts per square cm. When I pushed Talk on an FRS walkie-talkie 10 cm away, the power jumped by over a hundred times. When an Android phone scanned for Bluetooth devices, a similar leap in radiation power occurred. Browsing by 2.4 GHz on the phone had a strong effect too, as did activity using LTE cellular. A dual-band wi-fi router 1 m away registered 0.800 microwatts per sq. cm. A 78mm halogen light tube almost touching the detector also produced a reading. Interestingly, a 5 GHz wi-fi connection on the phone did not elicit a radiation rise on the meter. The sources that caused radiation increases utilize frequency bands from about 400 Mhz to 2.6 GHz.
The detector not responding to 5 GHz signals is disappointing. At least it can sense low frequency RF convincingly at 1 m and very dramatically at closer proximity.
Radio frequencies are just EM fields within certain common bands modulated for communication. This field detector shows general EM values in big numbers and a graph, but relegates RF (radiation power) to a simple number on the default screen. A graph for RF would have been beneficial since home and office environments now abound with data transmissions.
If you have walked past an FM radio or tried holding rabbit ear TV antennas in your hands, you will know the human body blocks, reflects, or conveys EM waves depending on the frequency. As a result, RF and especially EM numbers fluctuate constantly when my fingers are around the middle of the instrument. I find the most steady readings are achieved when I put the device on a table. When I want measurements near an appliance or specific point, grasping the unit with just a couple fingers at the bottom end reduces bodily interference.
The manufacturer should have included labels to encourage holding the bottom. To their credit, they did include a wide plastic loop at the bottom for attaching a wrist strap. Using a strap will not really avoid EM and RF interference, but it makes carrying the device a bit easier.
The audible alarms for EM and magnetic fields are quite distracting when numbers briefly and repeatedly go above and below the thresholds. I found silencing the instrument preserves sanity. You can still set thresholds to make the power button flash red, which is nicer than frequent beeping.
I am sure checking industrial machinery, vehicles, and cell towers with this detector would be eye-opening. At home, this detector will tell you if you are near moving magnets, microwaves, powered electronics, active wires, transformers, walkie-talkies, 2.4 GHz wi-fi equipment, LTE cellular phones, and gadgets generating various EM, RF, and magnetic fields. When this instrument is touching or extremely close to those devices, it may sense multiple types of fields, and fewer will be detected as you move away. This instrument is both simple and confusing to read, so knowledge is definitely required to interpret the results. At the same time, the lack of frequency measurement, axis labelling, RF graphing, and other omissions prevent this product from being an engineering tool despite appearances. Even so, this product is competitive with other products in its price class. In the end, it provides enough insight to satisfy my curiosity about field safety and nominal operations for equipment.
Images in this review
Top reviews from other countries
- KabReviewed in the United States on May 29, 2025
5.0 out of 5 stars Know What You're Trying to Measure
Key to using any instrument is to know what you are trying to measure, and the expected results. That is no different with this device. As an inexpensive entry-level device, initial impressions were quite good, with the bright LCD displaying electric, magnetic, and radiofrequency (‘radiation power’) fields, with the temperature.
In testing, I found the sensitivity to single circuit household wiring was quite good, and the radiation power was a relative indication of my WI-FI strength (in three dimensions, from the access point). I did not get a measurement for an electrical field in cables that carry PoE (power over ethernet), probably because of internal shielding. It has reinforced my belief when using a microwave, to set the timer and leave the room. (Minimize the time exposed, maximize the distance from the source, and take advantage of the shielding effect of walls and furniture.)
When electricity passes through a wire, it creates an electric field around the wire in three dimensions (on the x, y, and z axes). So the direction of the meter (in relation to the field; up, sideways, or straight on) can affect the measurement, and it is worthwhile to check for the highest value. The strength of the field will rapidly decrease as you move further from the source. Using this principle, when testing a stud wall known to have household wiring, I was able to pinpoint the exact location. This instrument has earned a place in my electrical tool kit.
[As a side note to knowing what you are measuring, I was momentarily confused when the instrument went into alarm, but I was not in a measurable field. Playing back the last few seconds in my mind, I realized that after sliding it across a wall, I brushed off the dust by wiping it on my shirt, apparently generating a static charge.]
- SST316Reviewed in the United States on June 3, 2025
4.0 out of 5 stars Nicely made but not very useful
There is a lot of interest in emf and quite a bit of fear about the potential harmful effects but there is actually very little scientific support to justify the fears. To take advantage of the interest and fear, a number of manufacturers make devices that claim to monitor emf radiation. Most of these cheap meters don’t really allow you to assess the types and strength of the emf you are exposed to.
The FNIRSI ERD-10 definitely fits in the category of cheap emf meter so it has limited utility but for a cheap emf meter it is much better than most of the similarly priced ones. But this is by no means a professional emf meter. The display is colorful, bright and clear. The user interface is simple and easy to use. The ability to see graphs of electrical and magnetic fields is very nice.
To actually assess emf what you really want to know is the strength of the electrical and magnetic fields. To do that you need a device that measures in three dimensions and is calibrated. It should also display the frequency of the field. The FNIRSI ERD-10 only measures in one dimension, is not calibrated and doesn’t display frequency.
So what can you use the FNIRSI ERD-10 for? It does seem to pick up electrical and magnetic fields from common household sources, for example electrical outlets and microwave ovens. It also shows “radiantion” power from radio sources like Wi-Fi routers. But since the ERD-10 is not calibrated you can only get a sense of the relative strength of the field. And since it doesn’t display frequency you don’t know if the readings from your microwave are from 60Hz or 2.5GHz electromagnetic waves, which have vastly different effects on the human body.
I used the FNIRSI ERD-10 to locate wires behind walls. It was pretty time consuming though because the reading update slowly so you have to move the meter slowly to find the maximum readings.
I was less successful using the meter to measure WiFi radiation in my bedroom. I get a relatively high power reading right next to the router antenna but in the bedroom at the wall adjacent to the router I get a mix of high and low power readings so I don’t know if this is from WiFi or some other source.
My take on the FNIRSI ERD-10 is that it is a well made meter that is easy to use, but it is definitely not a professional emf meter. It is fun to use but I am not sure how practical it is. Maybe you will find a ghost.
- Features-Benefits-Quality-Value-Review.Reviewed in the United States on June 26, 2025
5.0 out of 5 stars High-quality, sensitive RF and EM radiation detector!
Why did you pick this product vs others?:
Avid electronics hobbyists who test and experiment with RF as well as curious bystanders in a technological world can use this device for exploring the world of RF and Electromagnetic Radiation.
Accuracy:
This seems to be a real-deal tool, as the accuracy so far is consistent with product specs.
Functionality:
Hobbyists, experimenters, STEM students, techs and engineers can appreciate the quality and functionality with straight-forward results. This tool also puts "Fun" into the functionality.
Ease of use:
User-friendly instructions, ready-to-go practicality, and easy operation make this among the finest EM detectors I've experimented with and tested.
Build quality:
This looks and feels like a real tool; real-world electronics lab and workbench quality.
Quality:
This is a serious tool, engineered and designed by professional engineers.
Size:
Product dimensions are indicative of professional engineering standards and experienced electronics designers.
- TechWizKid TruReviewsReviewed in the United States on June 15, 2025
5.0 out of 5 stars Excellent tool to analyze your EMF exposure
This tool is basic but it functions well to measure EMF and magnetic fields. When the tool is put near an electric field or magnetic field, an alarm will be triggered that beeps and makes the measurement reading flash red. You can adjust the sensitivity level for both types of fields that trigger the alarm. The built in rechargeable battery should last quite a long time, I've used it for several hours and the battery still is nearly fully charged.
I was very surprised at some of the readings and it has guided me to rearrange my electronics to minimize unnecessary exposure where I spend a lot of time, such as my desk and bed. For example, my iPhone barely emits any detectable EMF, whether it is locked, playing a video and even making a phone call. My LED backlit keyboard emits a significant amount of EMF considering it is only powered over a USB-A cable. My charging station also has a significant amount of EMF, even when it is not charging anything. Not surprisingly my WiFi router has one of the highest EMF levels.
- SJenkinsReviewed in the United States on July 1, 2025
3.0 out of 5 stars Ordered this becasue it sounded like a cool an fun gadget. It feels more like a toy grade unit.
Ordered this becasue it sounded like a cool an fun gadget. What I find is it feels more like a toy grade unit.
Yes it functions, I "think" it does what it says. What I mean is I have tried it out and can see my microwave appears to have way more leakage than I would have guessed. I did not find any hidden cameras or bugs in the hotel room when I traveled. I definately haven't found a ghost. I guess the most useful thing I tried with it was to locate a wire in a wall.
Overall, it will get relogated to the desk drawerwel small gadgets go to die.