---
product_id: 495852064
title: "Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black"
brand: "klein tools"
price: "$335"
currency: NZD
in_stock: true
reviews_count: 8
category: "Klein Tools"
url: https://www.desertcart.nz/products/495852064-klein-tools-mm420-digital-multimeter-auto-ranging-trms-multimeter-600v
store_origin: NZ
region: New Zealand
---

# 600V AC/DC voltage range True RMS for precise current & voltage CAT III/IV safety lead alert Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black

**Brand:** klein tools
**Price:** $335
**Availability:** ✅ In Stock

## Summary

> ⚡ Power Your Precision, Own Every Measurement

## 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,Orange/Black by klein tools
- **How much does it cost?** $335 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/495852064-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

- • **Built for the Hustle:** Rugged design withstands 6.6-foot drops, perfect for demanding job sites and fast-paced environments.
- • **Safety First, Always:** Lead-Alert LEDs ensure correct test lead placement, protecting you and your device from costly errors.
- • **Visibility On Demand:** Backlit LCD display guarantees clear readings even in dimly lit or cramped spaces.
- • **Precision Meets Power:** Auto-ranging TRMS tech delivers pinpoint accuracy on voltage, current, and resistance every time.
- • **All-in-One Diagnostic Tool:** Measures temperature, capacitance, frequency, duty cycle, continuity, and diode tests—your ultimate troubleshooting companion.

## Overview

The Klein Tools MM420 is a professional-grade auto-ranging TRMS digital multimeter designed for accurate measurement of AC/DC voltage up to 600V, current up to 10A, and resistance up to 50 MΩ. Featuring advanced safety lead-alert LEDs, a backlit LCD for low-light visibility, and a rugged build that withstands drops up to 2 meters, it’s engineered for reliability in residential, HVAC, and light industrial settings. This versatile tool also measures temperature, capacitance, frequency, duty cycle, and performs diode and continuity tests, making it an indispensable device for millennial professionals who demand precision and durability on the job.

## Description

Product 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 Safety Warning 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.

Review: Does not come with carry case - Multimeter is good and so are its functions. However it does not come with a carry case as stated. False advertising
Review: Inadequate - Bought for my husband. But not impressed. He found inadequate.

## Features

- COMPLETE PACKAGE: Includes carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instructions, and 2 x AAA batteries
- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B57PFFYX |
| Batteries | 2 AAA batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | 218,848 in DIY & Tools ( See Top 100 in DIY & Tools ) 575 in Multi Testers |
| Colour | Orange/Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (721) |
| Date First Available | 7 Dec. 2022 |
| Display style | LCD |
| Included components | Digital Multimeter, TRMS Auto-Ranging, 600V, Temp |
| Item Package Quantity | 1 |
| Item Weight | 50 g |
| Item model number | MM420 |
| Manufacturer | Klein Tools |
| Material | Blend |
| Measurement Accuracy | 600V AC/DC |
| Part number | MM420 |
| Pattern | Multimeter |
| Power source type | Battery Powered |
| Product Dimensions | 23.7 x 12.9 x 9.7 cm; 50 g |
| Size | One Size |
| Specification met | Cat Iii 600v Safety Rating |
| Style | w/Lead Alert |

## Product Details

- **Brand:** KLEIN TOOLS
- **Colour:** Orange/Black
- **Item dimensions L x W x H:** 23.7 x 12.9 x 9.7 centimetres
- **Power source:** Battery Powered
- **Style:** w/Lead Alert

## Images

![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black - Image 1](https://m.media-amazon.com/images/I/51O0EAYj9aL.jpg)
![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black - Image 2](https://m.media-amazon.com/images/I/61G61oMpJeL.jpg)
![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black - Image 3](https://m.media-amazon.com/images/I/61x0nOpxbsL.jpg)
![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black - Image 4](https://m.media-amazon.com/images/I/51FLeGC6O9L.jpg)
![Klein Tools MM420 Digital Multimeter, Auto-Ranging TRMS Multimeter, 600V AC/DC Voltage, 10A AC/DC Current, 50 MOhms Resistance,Orange/Black - Image 5](https://m.media-amazon.com/images/I/61JV+XD63SL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐ Does not come with carry case
*by V***1 on 17 May 2025*

Multimeter is good and so are its functions. However it does not come with a carry case as stated. False advertising

### ⭐ Inadequate
*by H***V on 18 October 2025*

Bought for my husband. But not impressed. He found inadequate.

### ⭐⭐⭐⭐⭐ Review
*by M***E on 5 January 2026*

Does exactly what I bought it for

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.nz/products/495852064-klein-tools-mm420-digital-multimeter-auto-ranging-trms-multimeter-600v](https://www.desertcart.nz/products/495852064-klein-tools-mm420-digital-multimeter-auto-ranging-trms-multimeter-600v)

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-01*