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Klein Tools MM400 Multimeter, Digital Auto Ranging, AC/DC Voltage, Current, Capacitance, Frequency, Duty-Cycle, Diode, Continuity, Temp 600V

4.6 4.6 out of 5 stars 3,927 ratings

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Multimeter
Multimeter

Purchase options and add-ons

Brand Klein Tools
Power Source Battery Powered
Style Multimeter
Color Orange
Item Weight 8.2 Ounces

About this item

  • Multimeter measures up to 600V AC/DC voltage, 10A AC/DC current and 40 MOhms resistance
  • Electrical tester measures temperature, capacitance, frequency, duty-cycle, and test diodes and continuity
  • CAT III 600V safety rating
  • Built to withstand a 3.3-foot (1 m) drop and withstand daily wear and tear on the job site
  • Low battery indicator and easily accessible battery compartment
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations
  • Includes test leads, thermocouple with adapter, batteries and user manual

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1.78 x 3.07 x 6 inches; 8.2 ounces
  • Item model number ‏ : ‎ MM400
  • Department ‏ : ‎ Unisex Adult
  • Batteries ‏ : ‎ 2 AAA batteries required.
  • Date First Available ‏ : ‎ November 23, 2015
  • Manufacturer ‏ : ‎ Klein Tools
  • ASIN ‏ : ‎ B018EXZO8M
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.6 4.6 out of 5 stars 3,927 ratings

Product Description

Klein Tools MM400 Multimeter is an auto-ranging 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. Klein Tools Test and Measurement product line was exclusively designed from the ground up by electricians for electricians. 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. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. 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.

Important information

Safety Information

Do not attempt to measure resistance or continuity on live circuits.Read, understand and follow all instructions, cautions and warnings attached to and /or packed with all test and measurement devices before each use.Before each use verify meter operation by measuring a known voltage or current.Do not use the meter during electrical storms or in wet weather, and do not use the meter or test leads if they appear to be damaged.


From the manufacturer

klein
Klein

klein
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.

Digital Multimeter, Auto-Ranging, 600V

Klein Tools MM400 is an auto-ranging 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. Klein Tools’ Test and Measurement product line was exclusively designed from the ground up by electricians for electricians.

  • Measures up to 600V AC/DC voltage, 10A AC/DC current and 40 MΩ resistance
  • Measures temperature, capacitance, frequency, duty-cycle, and test diodes and continuity
  • CAT III 600V safety rating
  • Built to withstand a 3.3-foot (1 m) drop and withstand daily wear and tear on the job site
  • Low battery indicator and easily accessible battery compartment
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations
  • Includes test leads, thermocouple with adapter and batteries

FEATURES

Klein Tools

Klein Tools

Klein Tools

Auto-ranging multimeter is CAT III 600 V safety rated

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

Electrical Tester for residential and industrial use

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What's in the box

  • Test Leads, Batteries, Thermocouple, and User Manual
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    3,927 global ratings

    Customers say

    Customers like the performance, quality and value of the electric circuit testing device. For example, they mention it works well, is durable and feels solid. Some appreciate the readability and accuracy. That said, they say it's a reliable tool for the price.

    AI-generated from the text of customer reviews

    134 customers mention111 positive23 negative

    Customers like the performance of the electric circuit testing device. They mention that it works well for their needs, is incredibly useful, and has several functions that aren't found on most meters in this price range. Some appreciate the rubber case and kickstand. Overall, most are satisfied with the performance and functionality of the product.

    "...Lastly, this meter is pretty feature-packed, having all the standard gizmos in addition to AC/DC current, frequency, duty cycle, thermocouple..." Read more

    "It has everything for an HVAC tech. Capacitance and temperature. I haven't had any issues with it...." Read more

    "Unpacked this and put it to use. It worked will, but then I accidentally left it outside and it got rained on...." Read more

    "I liked the ruggedness and utility of it. I use it all the time. It stays in my tool bag." Read more

    126 customers mention104 positive22 negative

    Customers like the quality of the electric circuit testing device. They say it has a great build quality, is durable, and reliable. The meter is sturdy, and the readout is easy to read. Customers also mention that it has nice quality probes, and is easy-to-handle. Overall, customers are satisfied with the quality and functionality of the product.

    "...The continuity test is pretty decent, and it has a light and a beeper, which is great in environments where hearing protection is required...." Read more

    "...I haven't had any issues with it. It's a very nice digital multimeter.. worth every penny." Read more

    "...happy with the Klein MM400, it's small and easy to handle, has nice quality probes and feels solid...." Read more

    "I liked the ruggedness and utility of it. I use it all the time. It stays in my tool bag." Read more

    90 customers mention84 positive6 negative

    Customers appreciate the value of the electric circuit testing device. They say it is a reliable tool for the price, and is worth buying. Customers also mention that the padded zipper case is worth the extra money for the protection it provides.

    "...It's a very nice digital multimeter.. worth every penny." Read more

    "Good durable multi meter for the home handyman that is affordable." Read more

    "Has the features I need at a good price" Read more

    "...Great vaule for the money" Read more

    70 customers mention55 positive15 negative

    Customers find the readability of the electric circuit testing device to be easy. They mention that the backlight is bright and the readout is easy to see. The meter is accurate and easy to use around the house. The back light makes the meter easy to read in the dark, which is a definite plus. Customers also appreciate the simple dial and auto range feature.

    "...The readout is clear and crisp, and the backlight works wonderfully...." Read more

    "...The simple dial and auto range feature makes it easy to use and the on demand back-light and auto-shutoff to save battery are features I was..." Read more

    "FULL OF FEATURES, EASY TO USE." Read more

    "...They are too short. This becomes extremely frustrating when trying to attach jumper wires that have alligator clips on the end...." Read more

    52 customers mention40 positive12 negative

    Customers like the accuracy of the electric circuit testing device. They say it's accurate enough, the probe is accurate, and it'll read the ambient air temperature accurately. Some customers also mention that it'd be a good addition to have a heat sensor and a thermal couple for temperature checking.

    "It has everything for an HVAC tech. Capacitance and temperature. I haven't had any issues with it...." Read more

    "...The other nice feature on this particular unit is that it has a heat sensor...." Read more

    "...This one seams to be as good, it is as accurate, compact, and does everything I need out of a electrical meter...." Read more

    "...Mainly, it lacks range, overall accuracy, and true RMS functionality...." Read more

    21 customers mention15 positive6 negative

    Customers like the backlight of the electric circuit testing device. They say it's useful, bright, and easy to read. Some say the screen lights up to make it easier to read, and some love the light option. Overall, most are satisfied with the back light and beeper functionality of the product.

    "...The continuity test is pretty decent, and it has a light and a beeper, which is great in environments where hearing protection is required...." Read more

    "...simple dial and auto range feature makes it easy to use and the on demand back-light and auto-shutoff to save battery are features I was looking..." Read more

    "...that prevented it from getting 5 stars from me is the backlight will not stay on long enough and the probe ends are too short...." Read more

    "...The meter seems sturdy, the backlight is bright and the readout is easy to see." Read more

    17 customers mention8 positive9 negative

    Customers are mixed about the size of the electric circuit testing device. Some mention that it's compact size allows easy operations in tight locations, while others say that it lacks pockets and is too small.

    "...from me is the backlight will not stay on long enough and the probe ends are too short...." Read more

    "...I'm really happy with the Klein MM400, it's small and easy to handle, has nice quality probes and feels solid...." Read more

    "...And, for the size of the housing, the rotary dial seems too small...." Read more

    "...This one seams to be as good, it is as accurate, compact, and does everything I need out of a electrical meter...." Read more

    19 customers mention3 positive16 negative

    Customers are dissatisfied with the voltage of the electric circuit testing device. They mention that it reads completely wrong, the reading is not consistent, and it wouldn't measure any voltage. Some say that the meter does not measure DC volts and that there is no low voltage or impedance calibration.

    "...The one inconvenience is that the unit defaults to AC for and voltage and current measurements...." Read more

    "...I'd known before I bought a Klein multimeter is that it defaults to AC in all current and voltage modes, and requires a press of the SEL button to..." Read more

    "...but I testing today after got package in , not sure why is NOT read auto range DV volts I try changing see any manual switch from AV to DV there is..." Read more

    "...The voltage reading is not consistant (competed against another meter) especially in DC voltage. The ohm reading is not consistant as well...." Read more

    Missing the test leads - the most important part!
    5 Stars
    Missing the test leads - the most important part!
    Update: I reached out to Klein Tools (thru Amazon Customer Service) and they righted the wrong. They refunded the full amount and told me to keep the product! Excellent service. Updating from 1-star ⭐️ to 5-stars 🌟🌟🌟🌟🌟 as long as the multimeter performs as expected.Original Review:Packaging - 1 out of 5Obviously used/returned and just taped back together. Also, the "indestructable" case that I bought from a separate company came with more padding and cushion in the packaging. This was literally just in a couple thin plastic bags with absolutely no protection.The product itself looks to be in good condition, but it is missing the most important parts - THE TEST LEADS! That's like selling a car without the wheels and tires!!I honestly can't remember if I bought the "Used - Good Condition" option, or a "NEW" option. I am pretty certain I went with the NEW option as the price was within a dollar or two of being the same, but this is obviously not new. I was looking forward to getting this, but now I am very unhappy about it.
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    Top reviews from other countries

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    petshopboy
    5.0 out of 5 stars Easy to use and well made
    Reviewed in Canada on November 19, 2023
    Style: MultimeterPattern Name: MultimeterVerified Purchase
    Alexis Raúl Cancino Sandoval
    5.0 out of 5 stars Muy resistente y confiable
    Reviewed in Mexico on January 24, 2023
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    Einfach Super sehr gute Verarbeitung ich bin vollkommen zufrieden
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    Reviewed in Germany on June 3, 2023
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    Lars E
    5.0 out of 5 stars Versatile useful digital multi meter
    Reviewed in Sweden on August 5, 2022
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    Anna Maria
    5.0 out of 5 stars Semplice e robusto
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