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  • Klein Tools MM450 Slim Digital Multimeter, Reverse Contrast Display with Lead Alert, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity

Klein Tools MM450 Slim Digital Multimeter, Reverse Contrast Display with Lead Alert, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity

4.5 out of 5 stars (247)
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About this item

  • Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
  • Measures up to 600V AC/DC voltage, 10A AC/DC current and 50 M resistance, continuity, temperature, capacitance, frequency, duty-cycle, and test diodes
  • High visibility, reverse contrast display with automatic backlight adjustment
  • Lead-Alert protection with LEDs for test lead placement
  • Slim profile allows multimeter to conveniently fit into most pockets

Frequently bought together

This item: Klein Tools MM450 Slim Digital Multimeter, Reverse Contrast Display with Lead Alert, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity
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From the manufacturer

Klein Tools
Klein Tools

klein tools
About Klein Tools

As an American manufacturer of hand tools for more than 160 years, Klein Tools makes premium-quality, professional-grade tools that deliver performance, durability and precision. Our team continues to put six generations of expertise into each tool by using the highest quality materials and superior workmanship.

Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day … Since 1857.

Multimeter, Slim Digital Meter, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity

Klein Tools MM450 Multimeter is a TRMS auto-ranging slim multimeter that measures AC/DC voltage, AC/DC current, and resistance. It can also measure temperature, capacitance, frequency, duty-cycle, and test diodes and continuity. It features a high visibility, reverse contrast display with an optical sensor to automatically optimize viewing in dark or bright ambient light.

  • Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
  • Measures up to 600V AC/DC voltage, 10A AC/DC current and 50 MΩ resistance, continuity, temperature, capacitance, frequency, duty-cycle, and test diodes
  • High visibility, reverse contrast display with automatic backlight adjustment
  • Lead-Alert protection with LEDs for test lead placement
  • Slim profile allows multimeter to conveniently fit into most pockets
  • Low battery indicator and easily accessible battery and fuse compartment
  • Durable meter built to withstand a 6.6-Foot (2 m) drop
  • Includes carrying pouch, safety rated CAT III 1000V/CAT IV 600V test leads, thermocouple with adapter and 2 x AAA batteries

FEATURES

Klein Tools

Multimeter ensures improved accuracy with auto-ranging TRMS

Klein Tools

Meter measures up to 600V AC/DC voltage and 10A AC/DC current

Klein Tools

Slim profile and Lead-Alert with LEDs for lead placement

MM450
MM325
MM420
MM720
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Customer Reviews
4.5 out of 5 stars 247
4.7 out of 5 stars 2,429
4.6 out of 5 stars 499
4.7 out of 5 stars 308
Mfg. No. MM450 MM325 MM420 MM720
Slim Digital Multimeter, TRMS Auto-Ranging, 600V, Temp Digital Multimeter, Manual-Ranging, 600V Digital Multimeter, TRMS Auto-Ranging, 600V, Temp Digital Multimeter, TRMS Auto-Ranging, 1000V, Temp, Low Impedance
Voltage 600V AC/DC 600V AC/DC 600V AC/DC 1000V AC/DC
Frequency 1 Hz - 50 KHz — 1 Hz - 50 KHz 1 Hz - 500 KHz
Current 10A AC/DC 10A DC 10A AC/DC 10A AC/DC
Capacitance 400 µF — 400 µF 6000 µF
Ohms (Resistance) 50 MΩ 2Ω 50Ω 60Ω
Temperature Range -40° to 1832°F (-40° to 1000°C) — -40° to 1832°F (-40° to 1000°C) -40° to 1832°F (-40° to 1000°C)
Included Carrying Pouch, Test Leads, Thermocouple with Adapter, and Batteries Test Leads, Batteries, and User Manual Test Leads, Batteries, Thermocouple, and User Manual Carrying Case, Test Leads, Thermocouple, Batteries, and User Manual
ET600
MM320KIT
CL320KIT
CL120KIT
RT250KIT
NCVT5KIT
Buying Options
Buying Options
Buying Options
Customer Reviews
4.6 out of 5 stars 1,404
4.8 out of 5 stars 2,310
4.6 out of 5 stars 1,348
4.6 out of 5 stars 837
4.8 out of 5 stars 1,770
—
Mfg. No. ET600 MM320KIT CL320KIT CL120KIT RT250KIT NCVT5KIT
Description Insulation Resistance Tester Digital Multimeter Electrical Test Kit HVAC Electrical Test Kit Clamp Meter Electrical Test Kit Premium Dual-Range NCVT and GFCI Receptacle Tester Electrical Test Kit Dual Range NCVT and GFCI Receptacle Tester Electrical Test Kit

Product information

Technical Details

Manufacturer ‎Klein Tools
Part Number ‎MM450
Product Dimensions ‎16.51 x 8 x 2.77 cm; 260.82 g
Batteries ‎2 AAA batteries required. (included)
Item model number ‎MM450
Is discontinued by manufacturer ‎No
Size ‎One Size
Colour ‎Orange/Black
Style ‎multimeter
Material ‎Blend
Pattern ‎multimeter
Power Source ‎Battery Powered
Item Package Quantity ‎1
Measurement Accuracy ‎See instructions
Certification ‎Cat Iii 600v, Ce, Ukca Certified
Included Components ‎Slim Digital Multimeter, TRMS Auto-Ranging, 600V, Temp
Batteries Included? ‎Yes
Batteries Required? ‎Yes
Battery Cell Type ‎Alkaline
Warranty Description ‎See Manufacturer Website
Item Weight ‎261 g

Additional Information

ASIN B0B6WW5ZX8
Customer Reviews
4.5 out of 5 stars (247)

4.5 out of 5 stars
鶹 Rank
Date First Available April 21 2023

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Klein Tools MM450 Slim Digital Multimeter, Reverse Contrast Display with Lead Alert, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity

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Product description

Klein Tools MM450 Multimeter is a TRMS auto-ranging slim multimeter that measures AC/DC voltage, AC/DC current, and resistance. It can also measure temperature, capacitance, frequency, duty-cycle, and test diodes and continuity. It features a high visibility, reverse contrast display with an optical sensor to automatically optimize viewing in dark or bright ambient light. The slim profile of the MM450 makes this meter almost the size of a cell phone and it conveniently fits into most pockets. The MM450 features the same quality leads you have come to expect from the Digital Multimeter line at Klein Tools. Years of field research, combined with extensive input from electricians across America, inspired the development of meters and electrical testers loaded with innovative, time-saving features.

Top Brand: KLEIN TOOLS

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Customer reviews

4.5 out of 5 stars
247 global ratings

Customers say

Customers find this electric circuit testing device to be a good product and pretty good meter that works very well at work and does everything they need. They appreciate the side entry test lead jacks and easy access to fuses in the battery compartment. The device receives positive feedback for its features and size, while customers have mixed opinions about its accuracy, display, and display brightness.
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20 customers mention quality, 20 positive, 0 negative
Customers find this electric circuit testing device to be a good product with quality construction. They describe it as a pretty good meter and an excellent tool. Some consider it the best DMM and appreciate its nice design and recognized quality.
Excellent meter, perfect for what I needed it for - and probably for future use for other projects. Would buy another!Read more
As far as measurements go it’s a fine meter. But three major complaints. First, the display. The inverted display is impossible to read outdoors....Read more
Great multimeter....Read more
Best DMM I've used...Read more
17 customers mention functionality, 12 positive, 5 negative
The electric circuit testing device works very well at work and does everything customers need. Users report no issues with the product, and the temperature sensor works well. The device helps accomplish tasks that an electrician would typically handle.
Works great. No issues. Bright adjustable display. Perfect for most hobbyists and home owners. Leads are long and flexible. Temp sensor works well....Read more
Works but interacting with settings isn't optimal and Eats Batteries...Read more
Works great so far...Read more
9 customers mention accessibility, 7 positive, 2 negative
Customers appreciate the accessibility features of this electric circuit testing device. They find the side entry test lead jacks and lead ports on the side convenient. The device provides easy access to fuses in the battery compartment and tells users where to plug in components. The terminals for the probes are positioned on the side, and customers value the ability to change leads.
...for school has come in handy many times, I like that it tells you where to plug in stuff depending on the setting you choose and that it has an...Read more
...will need, it's easy to read and hold, I like having the lead ports on the side....Read more
8 customers mention features, 6 positive, 2 negative
The electric circuit testing device offers features that are sufficient for most tasks and includes all the capabilities needed by common workers. It provides mid-tier capabilities with big features in a compact size, including a milliamp function.
...one is the best bang for the buck, by far, it has all the features any common worker will need, it's easy to read and hold, I like having the lead...Read more
Works but interacting with settings isn't optimal and Eats Batteries...Read more
7 customers mention size, 5 positive, 2 negative
Customers appreciate the size of this electric circuit testing device. They find it a good size to carry in their tool pouch and are satisfied with the size of the volt meter.
I liked the size and sturdy construction of the case. It should have come with a stand of the back....Read more
13 customers mention accuracy, 9 positive, 4 negative
Customers have mixed opinions about the accuracy of this electric circuit testing device. Some find it very accurate and report that the meter passed all tests with displayed digits of precision. However, others note it is not a highly accurate bench meter, with one customer mentioning a 3.75% error that can throw calculations off, while another describes it as sometimes imprecise.
8 customers mention display, 4 positive, 4 negative
Customers have mixed opinions about the display of this electric circuit testing device. Some find the oversized display easy to read and consider it a great screen that's easier to read than older meters. However, others report that it's difficult to see from an angle, the background is hard to see, and the inverted display makes it impossible to read outdoors.
...First, the display. The inverted display is impossible to read outdoors....Read more
...4 Visual que for short testing isn't that great....Read more
8 customers mention display brightness, 5 positive, 3 negative
Customers have mixed opinions about the display brightness of this electric circuit testing device. Some find the screen bright and appreciate the adjustable display feature, while others report that the display is not bright or very faded. The device features a negative backlit screen with white on black LCD technology.
Works great. No issues. Bright adjustable display. Perfect for most hobbyists and home owners. Leads are long and flexible. Temp sensor works well....Read more
...The auto backlight is useless and the manual backlight isn’t bright enough for a well lit room. Second, the battery life sucks....Read more

Top reviews from Canada

  • Captainzeb
    5.0 out of 5 stars Does what it should
    Reviewed in Canada on April 18, 2025
    Verified Purchase
    Works great. No issues. Bright adjustable display. Perfect for most hobbyists and home owners. Leads are long and flexible. Temp sensor works well. Nice case too.
    Helpful
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  • Droz37
    5.0 out of 5 stars Best DMM I've used
    Reviewed in Canada on July 3, 2024
    Verified Purchase
    I'm an avionics systems technician, I've used a lot of multimeters over the years, this one is the best bang for the buck, by far, it has all the features any common worker will need, it's easy to read and hold, I like having the lead ports on the side.

    Only thing I noticed when I first started using it was the dial is a little too low profile, can be a little tricky to grasp it.
    One person found this helpful
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  • Tonio Mecanico
    4.0 out of 5 stars Ergonomique mais pas très précis en résistance.
    Reviewed in Canada on September 8, 2025
    Verified Purchase
    Compactes, efficace et bien protégé, ce multimètre est agréable à utilisé, cependant j’enlève une étoile car la lecture de la résistance est lente et parfois imprécise, pas tellement meilleur que mon mastercraft bon marché.
    Helpful
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  • Cdlem8
    5.0 out of 5 stars Livraison rapide
    Reviewed in Canada on November 18, 2024
    Verified Purchase
    Produit de qualité reconnue à un prix raisonnable
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  • Adam Vaughan
    5.0 out of 5 stars Works great so far (:
    Reviewed in Canada on September 18, 2024
    Verified Purchase
    Using this for school has come in handy many times, I like that it tells you where to plug in stuff depending on the setting you choose and that it has an option to sense temperature. It also comes with batteries (:
    Helpful
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  • William Sherman
    5.0 out of 5 stars checked with other multimeters seems very accurate
    Reviewed in Canada on December 8, 2024
    Verified Purchase
    I liked the size and sturdy construction of the case. It should have come with a stand of the back. I need an accurate MM everyday checking marine and auto batteries and household modifications.
    Helpful
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  • Brian Perriman
    5.0 out of 5 stars Great multimeter.
    Reviewed in Canada on April 14, 2024
    Verified Purchase
    Well made. Easy to use.
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  • WPaul
    2.0 out of 5 stars Works but interacting with settings isn't optimal and Eats Batteries
    Reviewed in Canada on January 25, 2025
    Verified Purchase
    Have bough a few of these. They work.... but the more we use them, the less were inclined to recommend them. Have Started to swap them out.. Expected more from Klein

    Spend a lot of time repeat fiddling with the meter settings , or trying to beat the power off timeout

    #1 Aggressive power saving (There is a option to Lock the meter on but then #3 is even worse.. especially if you forget to turn it off). Would be nice to be user settable
    #2 Doesn't remember last sub setting (if changed from default.. On power up sub option goes back default (IE. Voltage Defaults to A/C on power on but we work with D/C) . would be much better to have a Physical dial option for each mode (vrs Physical Dial selection + digital sub option switching).
    #3 Eat batteries way more than any other meter we use (At least with most of them. 1 seems to have better battery life). Never seen a meter blow through batteries more than this one. I'd think Klein may also own a battery factory :-)
    #4 Visual que for short testing isn't that great. We usually work with Headphones; so its harder to quickly check via buzz or directly thru squinting at the meter display. Would be nice if there was a large LED which would light up
    #5 Don't normally see this; but would be nice to have option for D/C adapter power source
    4 people found this helpful
    Helpful
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Top reviews from other countries

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  • Benjamin Paez
    4.0 out of 5 stars Buen equipo, mala pantalla.
    Reviewed in Mexico on March 7, 2025
    Verified Purchase
    Buen equipo, solo que la pantalla no tiene buena visibilidad en exterior, y con luz directa del sol no se ve.
    Report
  • Jesus salvador García lara
    5.0 out of 5 stars Muy buen multimetro calidad
    Reviewed in Mexico on May 26, 2024
    Verified Purchase
    El tamaño es perfecto cumplieron sus funciones muy práctico
    Report
  • 鶹 Customer
    5.0 out of 5 stars Good meter
    Reviewed in the United States on March 5, 2026
    Verified Purchase
    Great quality not too expensive
    Report
  • Maria Antonieta Leiva
    5.0 out of 5 stars Excelente
    Reviewed in the United States on December 14, 2025
    Verified Purchase
    Muy util para el trabajo de mi esposo.
    Report
  • Ivan Price
    4.0 out of 5 stars Accuracy
    Reviewed in the United States on December 11, 2022
    Verified Purchase
    Whenever I get a new Multi-meter (VOM), I put it through a series of tests at my bench before I using it in the field. I have a personally made PC board, that has set parameters, that I use to test for voltage, resistance and current readings. This way I know how reliable and accurate the multimeter is for use in the field. There are certain expectations, when it comes to how accurate a reading is. A Digital Multimeter like this one, should have an accuracy rate of plus or minus 1%. Meaning, if the voltage being read is set for 100 Volts DC. Then, the meter reading must be between 99 -101 VDC or the meter doesn't pass the test. This meter passed all tests, except one ...The current / amperage test. I was testing small current, expecting the reading to be at 5.53 milliamps (0.00553 amps) plus or minus 1%. The meter read 5.74 milliamps (0.00574 amps) which is out side the 1% rate. It should have read somewhere between 5.47 milliamps and 5.58 milliamps. This means the meter has a error in amperage of plus 3.75% to what ever the actual reading should be. Some might say "So What" and that a plus error of .21 milliamps isn't anything to worry about. Well, in most cases it wouldn't make much difference. But when you are working on Computer boards and the voltage is 5v max and the currents are in the low Milliamps and into the Microamps range, (which this meter is suppose to do) a 3.75% error WILL throw your calculations off and make you frustrated at the readings and calculations.....Causing an never ending cycle of ... WTF !!! This meter will not be used in the field... it will be a "lab" used meter at this point and I will not buy another. Hope this helps someone !!
    Customer image
    Ivan Price
    4.0 out of 5 stars
    Accuracy

    Reviewed in the United States on December 11, 2022
    Whenever I get a new Multi-meter (VOM), I put it through a series of tests at my bench before I using it in the field. I have a personally made PC board, that has set parameters, that I use to test for voltage, resistance and current readings. This way I know how reliable and accurate the multimeter is for use in the field. There are certain expectations, when it comes to how accurate a reading is. A Digital Multimeter like this one, should have an accuracy rate of plus or minus 1%. Meaning, if the voltage being read is set for 100 Volts DC. Then, the meter reading must be between 99 -101 VDC or the meter doesn't pass the test. This meter passed all tests, except one ...The current / amperage test. I was testing small current, expecting the reading to be at 5.53 milliamps (0.00553 amps) plus or minus 1%. The meter read 5.74 milliamps (0.00574 amps) which is out side the 1% rate. It should have read somewhere between 5.47 milliamps and 5.58 milliamps. This means the meter has a error in amperage of plus 3.75% to what ever the actual reading should be. Some might say "So What" and that a plus error of .21 milliamps isn't anything to worry about. Well, in most cases it wouldn't make much difference. But when you are working on Computer boards and the voltage is 5v max and the currents are in the low Milliamps and into the Microamps range, (which this meter is suppose to do) a 3.75% error WILL throw your calculations off and make you frustrated at the readings and calculations.....Causing an never ending cycle of ... WTF !!! This meter will not be used in the field... it will be a "lab" used meter at this point and I will not buy another. Hope this helps someone !!
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Product Summary: Klein Tools MM450 Slim Digital Multimeter, Reverse Contrast Display with Lead Alert, Auto-Ranging TRMS, 600V AC/DC Voltage, Current, Resistance, Temp, Frequency, Continuity

From KLEIN TOOLS

4.5 out of 5 stars, 247 ratings

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About this Item

  • Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
  • Measures up to 600V AC/DC voltage, 10A AC/DC current and 50 M resistance, continuity, temperature, capacitance, frequency, duty-cycle, and test diodes
  • High visibility, reverse contrast display with automatic backlight adjustment
  • Lead-Alert protection with LEDs for test lead placement
  • Slim profile allows multimeter to conveniently fit into most pockets

Product description

Klein Tools MM450 Multimeter is a TRMS auto-ranging slim multimeter that measures AC/DC voltage, AC/DC current, and resistance. It can also measure temperature, capacitance, frequency, duty-cycle, and test diodes and continuity. It features a high visibility, reverse contrast display with an optical sensor to automatically optimize viewing in dark or bright ambient light. The slim profile of the MM450 makes this meter almost the size of a cell phone and it conveniently fits into most pockets. The MM450 features the same quality leads you have come to expect from the Digital Multimeter line at Klein Tools. Years of field research, combined with extensive input from electricians across America, inspired the development of meters and electrical testers loaded with innovative, time-saving features.
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