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Internet # 320822838

Model # MM720

Store SKU # 1007898865

Top Rated

1000-Volt Digital Multi-Meter, TRMS Auto-Ranging, Temp, Low Impedance

$99.97
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  • Ensures improved accuracy using automatic ranging TRMS technology
  • Meter measures up to 1000V AC/DC voltage and 10A AC/DC current
  • Reverse contrast display with automatic backlight control
  • View More Details

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Product Details

About This Product

Klein Tools MM720 Multimeter is an automatically ranging true root mean squared (TRMS) digital multimeter that measures AC/DC voltage, AC/DC current, and resistance. It can also measure temperature, capacitance, frequency, duty-cycle, diodes and continuity. It features a high visibility, reverse contrast LCD display with an optical sensor to automatically optimize viewability in dark or bright ambient lighting.

Highlights

  • Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
  • Tester measures up to 1000V AC/DC voltage, 10A AC/DC current and 60 MOhms resistance plus temperature, capacitance, frequency, low impedance (LoZ), duty-cycle, test diodes and continuity
  • High visibility, reverse contrast display with optical sensor to automatically optimize viewability in dark or bright ambient lighting
  • Low Impedance (LoZ) mode for identifying and eliminating ghost or stray voltages
  • Low battery indicator and easily accessible battery and fuse compartment
  • Tough meter built to withstand a 6.6-Foot (2 m) drop and is rated IP42
  • Includes carrying pouch, test leads, thermocouple with adapter, and batteries
  • CAT IV 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 # 320822838

Model # MM720

Store SKU # 1007898865

Specifications

Dimensions

Product Depth (in.)

1.88 in

Product Width (in.)

3.37 in

Details

Accuracy Measurement

True-RMS

Category Rating

IV

Features

Backlit, Data Logging, Interchangeable Leads

Functions Measured

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

Included

Batteries, Case, Test Leads

Maximum AC Current (A)

10

Maximum AC Voltage

1000

Maximum DC Voltage

1000

Maximum Frequency (MHz)

0.5

Maximum Resistance (ohms)

60M

Number of Functions

13

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

Why are y'all putting answers to questions about the MM420 under the "questions" section for the MM720. It seems like customers are being misled, given vague information, and/or misdirected. Why is there no mention of battery count/type, or warranty.
ByJul 10, 2026
1 Answer | 
Answer This Question

Dear Valued Home Depot Customer, We have reached out to the manufacturer and their Answer is, Thank you for your feedback. The question you referenced was submitted under the MM720 product page but was specifically about the MM420, so the response addressed the product the customer was asking about. Regarding the MM720, the battery and warranty information are available on the product details page. The MM720 operates on two AAA batteries (included) and is backed by a Limited Lifetime Warranty. If you have any additional questions about the MM720, please let us know or contact Klein Tools Customer Service at customerservice@kleintools.com for further assistance.

By|Jul 23, 2026


    Does this allow use of a K-Type temp probe (like the one pictures) or does it use something different? If so does it come with the temperature probe or do you need to purchase that separately?
    ByJun 20, 2026
    1 Answer | 
    Answer This Question

    Klein Tools Cat. No. MM720, Digital Multimeter, TRMS Auto-Ranging, 1000V, Temp, Low Impedance, uses a K-type thermocouple for temperature measurements. The meter includes a K-type thermocouple with adapter, so a temperature probe is included and does not need to be purchased separately. The MM720 can measure temperatures from -40° to 1832°F

    By|Jul 2, 2026

      (1)

      Does this multimeter take tempature readings?
      ByMar 5, 2026
      1 Answer | 
      Answer This Question

      Yes, the Klein Tools CAT No. MM420 Digital Multimeter, TRMS Auto-Ranging, 600V, Temp, takes temperature readings via the K-type thermocouple.

      By|Mar 5, 2026


        Does the MM720 have the capability to display 10 volt range with resolution 0.001?
        ByFeb 10, 2026
        1 Answer | 
        Answer This Question

        The Klein Tools Cat. No. MM720 1000-Volt Digital Multi-Meter has a 6V range with 0.001 resolution; after 6V it jumps to 60V with lower resolution.

        By|Feb 12, 2026


          Can this be used on cars, trucks and heavy duty vehicles
          ByDec 30, 2025
          1 Answer | 
          Answer This Question

          None of our clamp/multimeters measure parasitic draw, dwell time, RPM, or pulse width, but we are working on one that does in the future! If you do not need those measurements - in theory, yes, the Klein Tools MM720 Digital Multimeter can be used for automotive work.

          By|Jan 2, 2026


            will MM420 measure capacitance down to 1 microfared?
            ByAug 25, 2025
            1 Answer | 
            Answer This Question

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

            By|Aug 25, 2025


              will this detect irrigation valves
              ByApr 16, 2025
              1 Answer | 
              Answer This Question

              Klein Tools MM420 Multimeter is an auto-ranging, true root mean square (TRMS) 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.

              By|Apr 18, 2025


                Does this have an NVC mode function?
                ByMar 10, 2025
                1 Answer | 
                Answer This Question

                The Multimeter does not feature a non-contact voltage testing function

                By|Mar 12, 2025


                  Viewing 1-8 of 36

                  Customer Reviews

                  4.6 out of 5

                  • 4.6 out of 256 reviews
                  • 53% recommend this product
                  Filter by:
                  Showing 1-10 of 256 reviews
                  This is an excellent tool for voltage testing, the multimeter function makes testing the voltage range an easier task.
                  by
                  • Verified Purchase
                  The dc amperage testing isn’t working If this doesn’t work it goes back
                  by
                  • Verified Purchase
                  2 found this review helpful
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  do not buy
                  DO not buy this multimeter. The display backlight only stays on for a few seconds, making it useless. It feels like junk when compared to some of the less expensive meters from Ebay, and they are automatic where you do not have to push buttone to read DC or AC. In my opinion junk.
                  by
                  Response from Klein ToolsSep 28, 2026
                  Thanks for sharing your feedback. We’re sorry your experience wasn’t satisfactory, as we take pride in our long history of making high quality tools. Please reach out to our client services team at https://www.kleintools.com/contact-form/customer so we can investigate this further and address this issue. KleinTools
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    Junk
                    Got a bad unit. Bought it today, was excited to use it. Capacitance function did not read accurately, so I tried temperature. That did not work, either. So I tried continuity which also did not work. AC and DC voltages did work correctly.
                    by
                    Response from Klein ToolsSep 17, 2026
                    Thanks for sharing your feedback. We’re sorry your experience wasn’t satisfactory, as we take pride in our long history of making high quality tools. Please reach out to our client services team at https://www.kleintools.com/contact-form/customer so we can investigate this further and address this issue. KleinTools
                      This customer chose to rate the product and not provide text.
                      by
                      After a couple of months, it develops internal short.
                      Shorts batteries after a couple months. New batteries only last a few hours.
                      by
                      Response from Klein ToolsSep 8, 2026
                      Thanks for sharing your feedback. We’re sorry your experience wasn’t satisfactory, as we take pride in our long history of making high quality tools. Please reach out to our client services team at https://www.kleintools.com/contact-form/customer so we can investigate this further and address this issue. KleinTools
                        Love Klein Meters. Priced too High Here.
                        Nothing like selling the meter above list price! Very few places do. You can buy this many places, delivered to your door or pickup, for $5 less. Driving right past HD to their blue competitor to buy it tomorrow. Sometime I get disgusted by the new Home Depot.
                        by
                          Showing 1-10 of 256 reviews

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                          Product Snapshot

                          Suitable for professionals and home users seeking accurate, versatile measurements with auto-ranging and TRMS.
                          Ideal for technicians and homeowners, ensuring accurate electrical troubleshooting and maintenance.
                          Ideal for professionals seeking accurate True RMS measurements and robust CAT III 600V safety.
                          Built for pros: the rugged, waterproof multimeter with True-RMS & temperature measurement for accurate readings in harsh environments.

                          True RMS (TRMS) Measurement

                          Auto-Ranging

                          Temperature Measurement

                          Backlit Display

                          Measurement Functions

                          Capacitance, frequency, duty-cycle, LoZ, diodes, continuity
                          Amperage, Battery, Continuity, Resistance, Voltage
                          Capacitance, frequency, continuity, diode, resistance, voltage
                          Capacitance, Frequency, Duty Cycle, Continuity, Diodes, Resistance, Voltage, Amperage