---
product_id: 463567951
title: "Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance"
brand: "klein tools"
price: "¥21492"
currency: JPY
in_stock: true
reviews_count: 13
category: "Klein Tools"
url: https://www.desertcart.jp/products/463567951-klein-tools-mm420-digital-multimeter-auto-ranging-trms-multimeter-600v
store_origin: JP
region: Japan
---

# 600V AC/DC voltage range Auto-ranging TRMS accuracy 6.6-ft drop-tested durability Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance

**Brand:** klein tools
**Price:** ¥21492
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your precision with Klein’s pro-grade MM420 Multimeter!

## Quick Answers

- **What is this?** Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance by klein tools
- **How much does it cost?** ¥21492 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/463567951-klein-tools-mm420-digital-multimeter-auto-ranging-trms-multimeter-600v)

## Best For

- klein tools enthusiasts

## Why This Product

- Trusted klein tools brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Inclusive Kit:** Comes complete with CAT III/IV safety-capped leads, thermocouple, batteries, and instructions—ready to go out of the box.
- • **Safety First, Always:** Lead-Alert LEDs ensure your test leads are perfectly placed for safe, error-free measurements.
- • **Precision Meets Power:** Auto-ranging TRMS tech delivers pinpoint accuracy on voltage, current, and resistance every time.
- • **Hands-Free Convenience:** Built-in test lead holders, kickstand, and optional magnetic hanger let you multitask like a pro.
- • **Work Anywhere, Anytime:** Backlit LCD display and rugged drop-tested design keep you productive in any lighting or environment.

## Overview

The Klein Tools MM420 is a professional-grade digital multimeter featuring auto-ranging True RMS technology for accurate AC/DC voltage up to 600V, current up to 10A, and resistance up to 50MΩ. Designed by electricians for electricians, it includes safety-focused Lead-Alert LEDs, a backlit LCD for low-light visibility, and rugged durability tested to withstand 6.6-foot drops. Its versatile functions cover temperature, capacitance, frequency, and diode testing, all packed in a compact, job-site ready tool with included accessories for immediate use.

## Description

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. 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.

Review: precise and reliable digital multi-tester for pros! - it’s incredibly reliable and easy to use. the auto-ranging feature makes measuring voltage, current, and resistance quick and accurate, while the clear digital display ensures readings are easy to read. the compact, sturdy design feels professional and durable, perfect for both job sites and home projects. overall, this multi-tester delivers precision, convenience, and durability in one essential tool. great battery life too!!
Review: Very nice DMM for the money! Easy to use and has a wide range of functions! - This is a very nice DMM! Easy to use and has a wide range of functions. Great value for the money spent! Love it!

## Features

- VERSATILE FUNCTIONALITY: Measures AC/DC voltage up to 600V, 10A AC/DC current, 50MΩ resistance; additional features include continuity, temperature, capacitance, frequency/duty cycle and diode test
- LEAD-ALERT PROTECTION: LEDs on the meter illuminate to indicate proper test lead placement, enhancing accuracy and safety during measurements
- BACKLIT DISPLAY: LCD shows clear readings in low-light conditions for enhanced visibility
- ACCURATE MEASUREMENTS: Auto-ranging and True Root Mean Squared (TRMS) technology provides precise and accurate measurements
- CONVENIENT FEATURES: Test lead holders on the back of the meter, kickstand and optional magnetic hanger (Cat. Nos. 69445 or 69417) for hands-free operation
- DURABLE CONSTRUCTION: Built to withstand a 6.6-Foot (2 m) drop, ideal for use in basic and controlled electromagnetic environments such as residential, business, HVAC and light-industrial locations
- COMPLETE PACKAGE: Includes test leads with CAT III/CAT IV safety caps, thermocouple, instructions, and 2 x AAA batteries

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B57PFFYX |
| Batteries | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #5,259 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Multi Testers |
| Brand | KLEIN TOOLS |
| Color | Orange/Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (937) |
| Date First Available | June 27, 2022 |
| Display Style | LCD |
| Finish | Brushed |
| Global Trade Identification Number | 00092644693748 |
| Included Components | Digital Multimeter, TRMS Auto-Ranging, 600V, Temp |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.76 ounces |
| Item dimensions L x W x H | 9.33 x 5.08 x 3.82 inches |
| Item model number | MM420 |
| Manufacturer | Klein Tools |
| Material | Blend |
| Measurement Accuracy | 600V AC/DC |
| Measurement Type | Multimeter |
| Min. Operating Voltage | 9 Volts |
| Part Number | MM420 |
| Pattern | Multimeter |
| Power Source | Battery Powered |
| Product Dimensions | 9.33 x 5.08 x 3.82 inches |
| Shape | Rectangular |
| Size | One Size |
| Special Features | Lead-Alert; Auto-Range; Min/Max Measurements; Backlight; Auto Power-Off; Data-Hold |
| Specification Met | Cat Iii 600v Safety Rating |
| Style | Auto-Ranging |
| UPC | 092644693748 |
| Upper Temperature Rating | 60 Degrees Celsius |

## Product Details

- **Brand:** KLEIN TOOLS
- **Color:** Orange/Black
- **Item dimensions L x W x H:** 9.33 x 5.08 x 3.82 inches
- **Power Source:** Battery Powered
- **Style:** Auto-Ranging

## Images

![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance - Image 1](https://m.media-amazon.com/images/I/51O0EAYj9aL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ precise and reliable digital multi-tester for pros!
*by N***N on November 13, 2025*

it’s incredibly reliable and easy to use. the auto-ranging feature makes measuring voltage, current, and resistance quick and accurate, while the clear digital display ensures readings are easy to read. the compact, sturdy design feels professional and durable, perfect for both job sites and home projects. overall, this multi-tester delivers precision, convenience, and durability in one essential tool. great battery life too!!

### ⭐⭐⭐⭐⭐ Very nice DMM for the money! Easy to use and has a wide range of functions!
*by B***S on January 29, 2026*

This is a very nice DMM! Easy to use and has a wide range of functions. Great value for the money spent! Love it!

### ⭐⭐⭐⭐⭐ Nice Multimeter
*by J***R on October 7, 2025*

I bought this Klein MM420 to replace a perfectly functional, 40 year old, Heath 2372 multimeter that I gave to my teen daughter for her electronics work (as I used it when I was her age). This Klein is nice! It's a rugged easy to use multimeter with all of the basics and a few bells and whistles. . It may not be a Fluke in decimal accuracy or its high price point (which is good because I have no use for either of those things) but it IS a Klein which is why I bought it.

## Frequently Bought Together

- Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance
- WERJIA Hard Carrying Case for Klein Tools MM420/MM325/MM720/MM700/ET600/MM450 Digital Multimeter
- Klein Tools 69417 Rare-Earth Magnetic Hanger, with Strap

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-18*