Skip to Main Content
  • Instrumart
Instrumart logo
  • Products
  • Brands
  • Applications
  • Lab
  • Blog
  • Account
  • Email Us
  • 1-800-884-4967
  • What can we help you find?

    Can’t find what you’re looking for? Contact one of our engineers today. We’re open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET.
    • 1-800-884-4967
    • Email Us
    • Live Chat
  1. Multimeters

Extech MN42 Compact Digital Multimeter

Built-in non-contact voltage detector quickly checks for the presence of voltage from 100 to 600 VAC.

Extech MN42 Compact Digital Multimeter
Extech MN42 Compact Digital Multimeter
Retired products cannot be ordered
The Extech EX320 Mini Digital Multimeter is the recommended replacement

View Company Reviewsby Trustpilot
Part Number
  • MN42
Manufactured
  • By Extech
Includes
  • FREE Ground Shipping on orders of $1,000 or more
  • FREE Lifetime Tech Support
Product Manual Product Specs
Questions?
Call 1-800-884-4967 or email sales@instrumart.com. Open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET.
Trustpilot

Overview

Features

  • 0.5% basic accuracy
  • Over-sized high contrast LCD display
  • Double molded housing
  • CAT III-600V
  • Manual ranging
  • 2000 count
  • 1.5V and 9V Battery tests

Description

The Extech MN42 compact digital multimeter offers eight functions as well as non-contact voltage detection. The built-in non-contact voltage detector quickly checks for the presence of voltage from 100 to 600 VAC. Measurements are shown on an over-sized, high-contrast LCD display and double molded housing, the MN42 also offers CAT III-600V protection.

Other features of Extech MN42 compact digital multimeters include manual ranging, a 2000-count display and a basic accuracy of 0.5%. The MN42 measures AC and DC voltage to 600V and DC current to 10A. Offering a resistance of 2MΩ, this Extech digital multimeter also features diode/continuity measurement, as well as 1.5V and 9V battery tests.

The Extech MN42 compact digital multimeter ships complete with:

  • Test leads
  • 9V battery
  • Carrying case

Extech MN42 Compact Digital Multimeter Specifications

Feature Specification
Ranging Manual
Display Counts 2000
Basic Accuracy 0.5%
NC Voltage Detector 100 to 600 VAC
DC Voltage 600V (0.1 mV)
AC Voltage 600V (0.1 mV)
DC Current 10A (1 µA)
Resistance 2 MΩ (0.1Ω)
Diode/Continuity Yes
Battery Test 1.5V / 9V
Dimensions 5.9 x 2.75 x 1.8" (150 x 70 x 48mm)
Weight 9oz. (255g)

Documents

Spec Sheets

  • Extech MN42 Compact Digital Multimeter Datasheet PDF (339 KB)

Manuals

  • Extech MN42 Compact Digital Multimeter Manual PDF (383 KB)

Accessories

Extech TL803 Standard Test Leads
Extech TL803 Standard Test Leads

Standard replacement test leads, compatible with most multimeters.

$11.99
Extech TL805 Double Injected Test Leads
Extech TL805 Double Injected Test Leads

Professional grade, double coated PVC lead wires.

$16.99
Extech Alligator Clips
Extech Alligator Clips

CAT III-1000V rated alligator clips.

$13.19
Extech TL808 Professional Test Lead Kit
Extech TL808 Professional Test Lead Kit

8-piece professional test lead kit with CATIII-1000V safety rating.

Mfg. has stock
$35.99
Extech TL810 Electrical Test Lead Kit
Extech TL810 Electrical Test Lead Kit

8-piece, versatile, CAT III-1000V rated testing kit.

$53.99
Extech TL809 Electronic Test Lead Kit
Extech TL809 Electronic Test Lead Kit

Ideally suited for testing digital circuitry.

Mfg. has stock
$19.99
Extech TL740 Test Clip Set
Extech TL740 Test Clip Set

Industrial plunger style - spring loaded clip with steel jaws.

$30.79
Extech TL747 Test Probe Set
Extech TL747 Test Probe Set

Sharp probes for use on high density components and boards and for piercing insulation.

$21.99
Extech TL831 Test Lead Set
Extech TL831 Test Lead Set

12 piece industrial grade test lead kit.

In Stock
$159.00
Extech TL833 Test Lead Set
Extech TL833 Test Lead Set

Industrial test lead set with CAT III - 1000V rating.

$85.99
Extech TL841 Test Lead Kit
Extech TL841 Test Lead Kit

16-piece kit with multiple test lead tip configuration.

Mfg. has stock
$149.00

Need Help? Call a Temperature engineer at 1-800-884-4967

We're open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET

David S. headshot David S.
Applications Engineer
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Luke M. headshot Luke M.
Applications Engineer
5 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
David S. headshot David S.
Applications Engineer
Alex A. headshot Alex A.
Senior Applications Engineer
19 years at Instrumart
Dwight M. headshot Dwight M.
Senior Applications Engineer
28 years at Instrumart
Luke M. headshot Luke M.
Applications Engineer
5 years at Instrumart
Rhys D. headshot Rhys D.
Applications Engineer
Shawn D. headshot Shawn D.
Senior Applications Engineer
20 years at Instrumart
Ron J. headshot Ron J.
Temperature Engineering Lead
29 years at Instrumart
David S. headshot David S.
Applications Engineer

Recently Viewed

Extech MN42 Compact Digital Multimeter
Extech MN42 Compact Digital Multimeter
United States Canada Mexico
Shop
Products
Brands
Applications
Support
Customer Service
Ask a Question
Live Chat
Track Order
Fraud Prevention
Financing
Our Company
Blog
About Us
Contact Us
Jobs
Travel Information
Our Team
Privacy Policy
Terms and Conditions of Sale
Terms and Conditions of Purchase
Accessibility Statement
Connect
1-800-884-4967
sales@instrumart.com
Instrumart
35 Green Mountain Dr
S Burlington, VT 05403 US
Mo-Th 8:00am to 5:30pm ET
Fr 8:00am to 5:00pm ET
Join Us on Facebook
Follow Us on X

Instrumart is a member of a family of industrial stores

Instrumart Compressor World Pump World BioPharm World Filtration World Motion World Qualitrol Engineered Solutions Wholesale Air Pipe
© Instrumart 2025

Family of Industrial Stores

Welcome to our family of stores, your go-to source for a wide selection of commercial and industrial products in the flow control and automation sectors. Each store features a curated range of specialized industrial solutions, with many items designed to complement each other, ensuring you can find everything you need for your specific application. Explore the stores below to discover our extensive product offerings for your business needs.

  • Instrumart

    Shop Industrial and Laboratory Instruments.

    Shop Now!
  • Compressor World

    Shop Compressed Air Equipment.

    Shop Now!
  • Pump World

    Shop Industrial, Water, and Waste Water Pumps.

    Shop Now!
  • BioPharm World

    Shop Sanitary Process Solutions and Products.

    Shop Now!
  • Filtration World

    Shop Industrial Filters.

    Shop Now!
  • Motion World

    Shop Motion Control and Process Automation Systems.

    Shop Now!
  • Qualitrol

    Shop Remanufactured or Repair Automation Products.

    Shop Now!
  • Engineered Solutions

    Shop Custom Engineered and Manufactured Systems.

    Shop Now!
  • Wholesale Air Pipe

    Shop Air Piping.

    Shop Now!