Klein Tools MM420 600V TRMS Auto-Ranging Digital Multimeter
Klein Tools MM420 600V TRMS Auto-Ranging Digital Multimeter
Hero image 0 of Klein Tools MM420 600V TRMS Auto-Ranging Digital Multimeter, 0 of 10
Klein Tools

Klein Tools MM420 600V TRMS Auto-Ranging Digital Multimeter

|8 ratings

Key item features

  • Accurate Measurements: Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
  • Versatile Functions: Measures up to 600V AC/DC voltage, 10A AC/DC current, and 50 MOhms resistance, continuity, temperature, capacitance, frequency, duty-cycle, and test diodes
  • Lead Alert: Lead Alert protection with LED illumination for lead placement and an easy-to-view backlit display
  • Durable Design: Built to withstand a 6.6 ft. (2 m.) drop
  • Convenient Features: Low battery indicator and easily accessible battery and fuse compartment
  • Complete Kit: Includes test leads, thermocouple with adapter, batteries, and user manual
  • Safety Rated: CAT III 600V safety rating for use in basic and controlled electromagnetic environments
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Current price is $67.51
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  • Free 90-day returns
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Arrives by Sun, Jul 19
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Sold by Electronic Inventory Online, Inc.
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4.191256830601093 stars out of 5, based on 549 seller reviews(4.2)
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4.3 out of 5 stars
stars
8 ratings3 reviews
How item rating is calculated
  1. 5 stars63% (5)
  2. 4 stars25% (2)
  3. 3 stars0% (0)
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  5. 1 star13% (1)
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Showing 1-3 of 3 reviews

Aug 23, 2022
EngineerMan
5 out of 5 stars review

Great Value And Quality For Features

You get some top notch features with this multimeter. The quality and price of this meter are unmatched compared to others in the store. Will definitely buy another one and all other Klein Tool products.

Review from Klein Tools
Helpful?3VVT55JCI5IV1383932232
Jun 2, 2025
JohnL
4 out of 5 stars review

Good So Far, But Missing Little Things

I have only used the MM420 once. It seems to be a quality product, but I think that there are "little things" that could make it better. I like the Auto-Ranging feature, but the "SEL" button is too close to the side. I was holding the MM420 in my hand and accidentally pressed the button with my thumb from just holding it (I was holding it from the back). The light makes the display unviewable from a certain angle. I feel that some kind of case should have been included, not to protect the MM420 since it is supposed to be able to take a 6 Foot drop, but to protect the display, "contain" the lead wires, and hold the thermocouple with adapter and maybe the user manual.

Review from Klein Tools
Helpful?3VVT55JCI5IV1383932232
Feb 6, 2026
Joseph
Item details
Size: 1
Sold byElectronic Inventory Online, Inc.Delivered byWalmart
1 out of 5 stars review

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