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Franklin Sensors ProSensor M90 Stud Finder with 9-Sensors, Wood & Metal Stud Detector/Wall Scanner

4.4 out of 5 stars 1,848 ratings
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Purchase options and add-ons

  • ACCURATE: More sensors = More accuracy. Conventional stud finders have 1 or 2 sensors. The ProSensor M90 has 9, making it the most accurate stud sensing tool on the market. The ProSensor M90 has a max detection depth of 1.5". The LEDs track the location of studs while displaying the center and edges simultaneously.
  • EASY: One mode finds it all! The ProSensor M90 adjusts for a variety of depths, materials and textures. No calibration required. Press and hold the button to begin scanning. Unlike other stud sensors that give false readings, the ProSensor M90 allows you to start scanning anywhere, even over a stud.
  • DISPLAYS FULL STUDS: The ProSensor M90 displays the center and edges of studs simultaneously, showing single studs, double studs, and irregular configurations that other stud finders cannot detect. Works through drywall/sheetrock and more!
  • DURABLE: #1 Rated by consumers and professionals, the ProSensor M90 stud finder is both accurate and durable.
  • MORE INFO: Uses common AAA batteries. Is NOT compatible with rechargeable batteries.

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Product Description

stud finder

Higher Accuracy. Better Technology

The Franklin Sensors Family

A hand holding a stud finder

Shows the FULL WIDTH of studs

LEDs track stud center and edges simultaneously, showing single studs, double studs and irregular configurations other stud finders cannot detect.

A woman holding a stud finder with flowers

More Sensors = More Accuracy

Conventional stud finders have 1 or 2 sensors. The ProSensor M90 has 9 accuracy enhancing sensors.

A pro with a stud finder

Deep Scan Always On

One mode finds it all! Franklin Sensors stud finders auto-adjust for different wall's texture, depth and material. Works through interior sheetrock/drywall and more.

A pro holding a stud finder

Accurate and Easy

Just press and hold the button to start finding studs. No calibration required. Unlike conventional stud finders that give false readings, Franklin Sensors stud finders let you start scanning anywhere, even over a stud.

ProSensor T9
ProSensor M90
ProSensor M150
ProSensor 710+
ProSensor M210
Customer Reviews
4.4 out of 5 stars 3,057
4.4 out of 5 stars 1,848
4.5 out of 5 stars 2,832
4.5 out of 5 stars 10,288
4.6 out of 5 stars 3,836
Number of Sensor 8 9 9 13 13
Detection Depth 1 1/2" 1 1/2" 1 1/2" 1 3/5" 1 7/10"
Number of LEDs 9 9 15 13 21
Built in Bubble Level no data no data no data ✓ ✓
Live Wire Detection no data no data ✓ no data ✓
Ruler no data no data no data ✓ no data
Pencil Caddy no data no data no data no data ✓

Frequently Asked Questions

stud finder against a stud

What does the center green light mean?

In certain models, the center LED will turn green to indicate the exact center of the stud.

A stud finder with a single blinking light

What does the single blinking light mean?

Several of our models now have a low battery indicator. When the battery voltage is low, the second LED from the right will flash. Replace with two brand new batteries.

A stud finder with all lights on

Why do the LED lights flash when I first press the button?

In certain models, the LED lights will flash when you first press the button to assure you that the unit is on and receiving power.

A stud finder and 2 batteries

What batteries can I use?

The ProSensor M90 is not compatible with rechargeable batteries. For best results, use two non-rechargeable AAA batteries.

What materials do your stud finders detect through?

Sheetrock/Drywall

Our stud finders work best through a single layer of sheetrock/drywall.

Lath and Plaster

While many customers have reported success using our stud finders through lath and plaster, detection is not guaranteed due to irregularities in plaster thickness.

Incompatible Surfaces

We do not recommend using our stud finders through stucco, exterior siding, double layers of sheetrock/drywall (common in condos, townhomes and home theaters), tile, wood flooring, carpet or roofing.

Product information

Technical Details

Manufacturer ‎Franklin Sensors Professional Stud Finders
Place of Business ‎Franklin Sensors, 6675 N Pollard Ln, Meridian, ID 83646, United States, Tel. +1 (208) 918-2403
Part Number ‎FSM9002
Product Dimensions ‎13.67 x 6.99 x 5.08 cm; 200 g
Item model number ‎330995279
Is discontinued by manufacturer ‎No
Colour ‎Yellow
Material ‎Other
Power Source ‎Battery Powered
Item Package Quantity ‎1
Included Components ‎Stud Finder, instructions, Thank you card
Batteries Included? ‎No
Batteries Required? ‎No
Item Weight ‎200 g
Country of origin ‎USA

Additional Information

ASIN B07DPT6HSY
Customer Reviews
4.4 out of 5 stars 1,848 ratings

4.4 out of 5 stars
鶹 Rank
Date First Available Aug. 20 2018

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Price$44.99$36.99$79.99$40.99$27.99-27%$13.77
List: $18.75
Delivery
Get it by Monday, Jul 7
Get it by Monday, Jul 7
Get it by Monday, Jul 7
Get it by Monday, Jul 7
FREE Delivery
Get it by Monday, Jul 7
Customer ratings
4.44.4 out of 5 stars1,848
4.14.1 out of 5 stars5,006
4.64.6 out of 5 stars8,094
4.44.4 out of 5 stars3,057
4.54.5 out of 5 stars116
4.44.4 out of 5 stars12,197
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Customer reviews

4.4 out of 5 stars
1,848 global ratings

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Customers say

Customers like the accuracy, quality, and ease of use of the stud finder. They mention it's the best they've used, is nicer than the cheap stud finders, and is easy to use. However, some customers have mixed opinions on its performance.

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Stud finderQualityEase of usePerformance
15 customers mention "Stud finder"15 positive0 negative

Customers are satisfied with the accuracy of the stud finder. They mention it's the best and a huge improvement over the zircon finder they've been using for decades. Customers also say it's easy to use and no calibration is needed.

"...studs in your home for pictures,etc.lt’s easy to use and no calibration needed would order again for that reason shows the stud and the centre of..." Read more

"...Hold the handle and press and hold the button while using it. It found all the studs. Probably the best stud finder I've used...." Read more

"...These stud finders are the best. I read a lot of the reviews before buy it. These is the perfect choice." Read more

"...handle a drop or a busy work site, but it works very well and is very precise." Read more

13 customers mention "Quality"10 positive3 negative

Customers like the quality of the product. They mention it's nicer than the cheap stud finders and the best stud detector they've own. Some also say it feels cheap.

"So much nicer than the cheap stud finders!!" Read more

"Good product and fast service!" Read more

"My new favorite toy. Way easier, decent price, good quality, even though it's plastic it feels really durable. Very accurate." Read more

"...It's a frustrating and fumbly experience...." Read more

7 customers mention "Ease of use"7 positive0 negative

Customers find the product easy to use.

"...will work good for finding studs in your home for pictures,etc.lt’s easy to use and no calibration needed would order again for that reason shows..." Read more

"...Easily to use. No AAA battery, must buy your own and put it one yourself. Recommend for anyone looking for a stud finder...." Read more

"My new favorite toy. Way easier, decent price, good quality, even though it's plastic it feels really durable. Very accurate." Read more

"...the house to hang pictures and other things, super accurate and easy to use" Read more

18 customers mention "Performance"12 positive6 negative

Customers have mixed opinions about the performance of the tool. Some mention it works very well and is precise, while others say it doesn't even turn on.

"...n't look like it could handle a drop or a busy work site, but it works very well and is very precise." Read more

"...second sensor from right will blink for few seconds and then no other sensor is working...." Read more

"...Not sure why. I included a video and everything. Gave it 5 stars. It works." Read more

"Works fine but recommend getting the wider older model." Read more

Def worth it!
5 out of 5 stars
Def worth it!
So much nicer than the cheap stud finders!!
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Top reviews from Canada

  • Kevswick
    5.0 out of 5 stars Works great.
    Reviewed in Canada on June 27, 2025
    Verified Purchase
    Wish I had bought one years ago instead of using cheaper ones.
    Helpful
     Report
  • Randy Friesen
    5.0 out of 5 stars Stud finder
    Reviewed in Canada on May 14, 2025
    Verified Purchase
    Haven’t really used it yet but tried it and seems pretty accurate.l think it will work good for finding studs in your home for pictures,etc.lt’s easy to use and no calibration needed would order again for that reason shows the stud and the centre of the stud.
    Helpful
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  • Sheldon Maloff
    4.0 out of 5 stars Works like a charm
    Reviewed in Canada on October 21, 2024
    Verified Purchase
    After flipping open the battery compartment, adding two AAA batteries, and closing the compartment, I took it to a wall where I know I've identified studs in the past. Hold the handle and press and hold the button while using it. It found all the studs. Probably the best stud finder I've used. (Also, this model just finds studs, not live wires.)

    Subtracting one star because it seems to get confused at the corner of the walls and shows more lights than there are studs behind the wall. Might be the metal drywall corner bead messing with the sensors.

    The only other weird thing is delivery. It came in a brown 鶹 envelope, but the product was not in a box. Just in a sealed plastic bag with a label on it "ready to ship". No printed instructions either, but you can find those on the product listing page, or by turning the device over: instructions are embossed into the plastic, along with the embossing "read all instructions before use". Which is kind of hard if there are no printed instructions. I'm in favour of reduced packaging, this just caught me off guard.
    Helpful
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  • John Wayne Peck
    5.0 out of 5 stars When your a stud and you know it. This the stud Finder people should have.
    Reviewed in Canada on May 12, 2025
    Verified Purchase
    When you need to find the wooden studs in walls when renovating walls or ceiling . These stud finders are the best. I read a lot of the reviews before buy it. These is the perfect choice.
    Helpful
     Report
  • MW
    5.0 out of 5 stars Dead simple and reliable
    Reviewed in Canada on May 19, 2025
    Verified Purchase
    One button, intuitive readout.
    Helpful
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  • ~SG
    1.0 out of 5 stars defective in 2 orders
    Reviewed in Canada on February 24, 2025
    Verified Purchase
    I ordered this item twice and both the times even after using new AAA batteries the item won't work. Both the times after putting batteries in second sensor from right will blink for few seconds and then no other sensor is working. The quick test for moving finger around sensors doesn't work nor does any sensors work when kept against the wall.
    Helpful
     Report
  • B-rad
    5.0 out of 5 stars Def worth it!
    Reviewed in Canada on May 12, 2025
    Verified Purchase
    So much nicer than the cheap stud finders!!
    Customer image
    B-rad
    5.0 out of 5 stars
    Def worth it!

    Reviewed in Canada on May 12, 2025
    So much nicer than the cheap stud finders!!
    Images in this review
    Customer image
    Helpful
     Report
  • A. T. Stolk
    5.0 out of 5 stars Fool-proof and accurate.
    Reviewed in Canada on March 10, 2025
    Verified Purchase
    So, this thing is fool proof. Anyone can use it.

    The middle led is multi colour, so when it lights up as green, you know that you have the exact middle of the stud.
    (LED is clear green, photo does not do it justice due to bad ipad camera.)

    It is worth the extra money. Only needs to AAA unlike the 9V that other units take.

    I can fully recommend it.
    Customer image
    A. T. Stolk
    5.0 out of 5 stars
    Fool-proof and accurate.

    Reviewed in Canada on March 10, 2025
    So, this thing is fool proof. Anyone can use it.

    The middle led is multi colour, so when it lights up as green, you know that you have the exact middle of the stud.
    (LED is clear green, photo does not do it justice due to bad ipad camera.)

    It is worth the extra money. Only needs to AAA unlike the 9V that other units take.

    I can fully recommend it.
    Images in this review
    Customer image
    Helpful
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Top reviews from other countries

  • Brendan Patullo
    5.0 out of 5 stars works well
    Reviewed in Australia on January 8, 2020
    Verified Purchase
    Have used this a few times now & it is great at identifying exact location of studs.
    It got a little confused one time (all lights illuminating across the wall). However, when used on the opposite side of wall it worked perfectly - so maybe there was something setting it off. Overall very pleased & would recommend over cheaper less accurate items.
    Report
  • Carlos
    5.0 out of 5 stars Perfect accuracy
    Reviewed in the United Kingdom on March 20, 2025
    Verified Purchase
    Do exactly what the description said, good value for money, easy for use, functionality near to perfect, real accuracy, no to loud. I recommend it.
    Report
  • Michael Fisher
    5.0 out of 5 stars Accurate and easy to use
    Reviewed in Australia on June 19, 2021
    Verified Purchase
    Press the button, finds the stud. Let’s show the exact width of the stud as well. Excellent tool and much more accurate than others I have used in the past. Highly recommended.
    Report
  • Electrician
    5.0 out of 5 stars Very accurate and easy to use
    Reviewed in the United Kingdom on April 15, 2025
    Verified Purchase
    The most accurate stud finder I have used and I have used many different types. The LEDs light up red to show the width of the stud and when the centre of the unit is in the centre of the stud, a green LED lights up in the middle.

    There is no calibration against the wall required. Just hold the button and go.

    I've found of the unit has trouble finding a stud or is giving a random pattern, it is 99% because there are random studs in the wall.
    Report
  • Elle G
    5.0 out of 5 stars Great out of the box
    Reviewed in the United States on June 24, 2025
    Verified Purchase
    So far so good! I tested it on a wall that I know exactly where the studs are and this thing is spot on! Can't wait to use it, glad I can't find my old one
    Report