#1 Home Improvement Retailer

Internet # 320822819

Model # MM450

Store SKU # 1008522095

Product Images

Top Rated

600 Volt Slim Digital Multimeter, TRMS Auto-Ranging with Temp

$79.97
Apply Now
Pay $54.97 after $25 OFF your total qualifying purchase upon opening a new card. 
Apply for a Home Depot Consumer Card
  • Slim profile multimeter ensures accuracy with auto-ranging TRMS
  • Meter measures up to 600V AC/DC voltage and 10A AC/DC current
  • Lead-alert with LEDs for lead placement
  • View More Details

Free & Easy Returns In Store

Return this item within 90 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

Magic Apron Assistant is an AI virtual assistant. By proceeding, you consent to the recording and use of your information by The Home Depot (and authorized third parties). More information

Product Details

About This Product

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.

Highlights

  • 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 ft. (2 m) drop
  • Includes carrying pouch, safety rated CAT III 1000V/CAT IV 600V test leads, thermocouple with adapter and 2 x AAA batteries
  • CAT III 600V safety rating
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 320822819

Model # MM450

Store SKU # 1008522095

Specifications

Dimensions

Product Depth (in.)

1.09 in

Product Width (in.)

3.14 in

Details

Accuracy Measurement

True-RMS

Category Rating

III

Features

Audible Alert, Data Logging, Interchangeable Leads

Functions Measured

Amperage, Capacitance, Continuity, Diodes, Frequency, Resistance, Voltage

Included

Batteries, Case, Test Leads

Maximum AC Current (A)

10

Maximum AC Voltage

600

Maximum DC Voltage

600

Maximum Frequency (MHz)

0.05

Maximum Resistance (ohms)

40M

Number of Functions

11

Power Source

Battery Operated

Range

Auto Ranging

Returnable

90-Day

Warranty / Certifications

Certifications and Listings

CSA Certified

Manufacturer Warranty

Please refer to the attached warranty document in the Product Overview section above under Info & Guides.

Questions & Answers

Does this meter emit an audible beep when turned on, changing modes, during use, or by auto-shutoff? If yes to any of these, is it possible to enable non-beeping operation for this meter or any Klein multi-meter?
ByNov 1, 2026
1 Answer | 
Answer This Question

Yes, the Klein Tools Cat. No. MM450, Slim Digital Multimeter, TRMS Auto-Ranging, 600V, Temp, beeps when turned on, during continuity testing, and before automatic power-off. The automatic power-off feature can be disabled, but the sound cannot be turned off.

By|Nov 6, 2026


    Do the supplied leads come with alligator clips?
    ByFeb 6, 2026
    1 Answer | 
    Answer This Question

    Klein Tools Cat. No. MM450 Slim Digital Multimeter comes with leads with safety caps only. For leads with alligator clips, please consider purchasing Cat. No. 69381 Heavy-Duty Alligator Clip Test Leads or Cat. No. 69410 Replacement Test Lead Set, Right Angle, sold separately.

    By|Sep 4, 2026

      (1)

      I need to test a device to be sure it is 16.5 ohms. Will this meter work?
      ByMar 19, 2025
      1 Answer | 
      Answer This Question

      The MM450 can measure resistance up to 50 MΩ. In the 0 - 400.0Ω range, resolution is 0.1Ω, and accuracy is ±(1.2% + 5 digits). For full meter specs, please see the Instructions/Assembly document under Additional Resources From the Manufacturer.

      By|Mar 21, 2025


        Can this measures microfarads
        ByOct 31, 2024
        1 Answer | 
        Answer This Question

        Yes. For full meter specs please see the Instructions/Assembly document under Additional Resources From the Manufacturer

        By|Feb 14, 2025

          (1)

          Will this multimeter measure mA's? If it does, how high will it go? Example - I have a 11.1V, 2200mAh LiPo battery - will this meter read how many mA it has on it at the time of checking.
          ByMay 13, 2024
          2 Answers | 
          Answer This Question

          To measure mAh of a battery you put a steady current draw (do not short circuit) on the fully charged battery and measure it's output over time; multiply the measured current by the discharge cycle time in hours. Without a load, you cannot test a battery.

          By|Nov 12, 2024

            The MM450 will measure mA. For range, resolution, and accuracy please see the Instructions / Assembly document under Additional Resources From the Manufacturer.

            By|Jun 17, 2024

              (1)

              I have contacted Klein about micro leads for this model and they don’t make any micro leads. Any idea if there is any such thing as micro leads that will fit this unit?
              ByNov 30, 2023
              1 Answer | 
              Answer This Question

              Klein Tools does not make micro leads. This meter has standard banana style inputs.

              By|Nov 30, 2023


                What's the model number
                ByNov 14, 2023
                1 Answer | 
                Answer This Question

                MM450

                By|Oct 18, 2024

                  (1)

                  Where is this made
                  BySep 20, 2023
                  1 Answer | 
                  Answer This Question

                  The MM450 is made in China

                  By|Mar 26, 2024

                    (1)

                    Viewing 1-8 of 20

                    Customer Reviews

                    4.6 out of 5

                    • 4.6 out of 126 reviews
                    • 64% recommend this product
                    Filter by:
                    Showing 1-10 of 126 reviews
                    Magnetic hanger not included
                    Everything is all good but wish it would have had holding spot for leads on the back.
                    by
                      • Recommended
                      shipped the wrong product
                      Ordered the Klein multimeter and was sent a deadbolt
                      by
                        • Recommended
                        Great little meter! Does everything I need it to do. Would recommend to anyone.
                        by
                        • Verified Purchase
                        visibility issues
                        Bought this meeter today to work on an outdoor electrical issue. It was almost impossible to see the screen. I tried all settings and ended up putting up and getting old meter out. Klien really missed the mark. It even says high visibility on package.
                        by
                          • Recommended
                          1 found this review helpful
                          This customer chose to rate the product and not provide text.
                          by
                          • Verified Purchase
                          I didn't want to spend the $ on the more expensive brand so decided to give this a try. It was an excellent tool in helping me discover an automotive current draw. Readings were clear and precise. For the money, this is a really good value.
                          by
                          Good compact multi meter with a large display and it comes with a case
                          by
                          I borrowed this Klein model along with a $500.00+ Fluke from an electrician friend and the parameters were so close to the more expensive Fluke that it's a no brainer....the only thing is it's harder to read in the sunlight.
                          by
                          • Verified Purchase
                          This product came with a case and everything I needed. Love the capicitor feature
                          by
                          • Verified Purchase
                          Lost my fairly new Klein meter. Had to get another. Good to work with. Nice pouch.
                          by
                          Showing 1-10 of 126 reviews

                          Compare Key Features

                          current item

                          Product Snapshot

                          Ideal for professionals and home users, offering accurate TRMS measurements and advanced functions.
                          Ideal for technicians and homeowners, ensuring accurate electrical troubleshooting and maintenance.
                          Suitable for professionals and home users seeking accurate, versatile measurements with auto-ranging and TRMS.
                          Ideal for professionals needing accurate, safe measurements with auto-ranging and data logging.

                          True RMS (TRMS) Measurement

                          Auto-Ranging

                          Temperature Measurement

                          Backlit Display

                          Measurement Functions

                          Capacitance, frequency, duty-cycle, current, voltage, resistance, continuity, diodes
                          Amperage, Battery, Continuity, Resistance, Voltage
                          Capacitance, frequency, duty-cycle, LoZ, diodes, continuity
                          capacitance, frequency, duty-cycle, voltage, current, resistance