Klein Tools Digital Multimeter...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$166.03
$124.93

Klein Tools Digital Multimeter TRMS Auto-Ranging 600V AC/DC Temperature Measurement Slim Profile

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Model: MM450
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$166.03
$124.93
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Klein Tools Digital Multimeter TRMS Auto-Ranging 600V AC/DC Temperature Measurement Slim Profile

Professional-Grade True RMS Digital Multimeter with Temperature Measurement

The Klein Tools Digital Multimeter TRMS Auto-Ranging 600V AC/DC Temperature Measurement Slim Profile delivers professional-grade electrical testing performance for comprehensive voltage, current, and temperature measurement applications. This ABS construction digital multimeter features True Root Mean Square (TRMS) technology with automatic ranging designed for electricians, linemen, and electrical professionals, providing the reliable performance and industry-leading quality that tradesmen demand from America's most trusted tool manufacturer.

Professional Features & Benefits

Advanced Measurement Capabilities

  • True RMS Auto-Ranging Technology - Delivers increased accuracy for AC measurements with automatic range selection, eliminating manual range switching for faster testing
  • Comprehensive Measurement Functions - Measures up to 600V AC/DC voltage, 10A AC/DC current, 50MΩ resistance, temperature (-40° to 1832°F), capacitance (400 µF), frequency (1 Hz to 50 KHz), duty-cycle, continuity, and diode testing
  • Temperature Measurement with Thermocouple - Includes thermocouple with adapter for precise temperature readings from -40° to 1832°F (-40° to 1000°C) for HVAC and electrical troubleshooting
  • 4000 Count LCD Display - High visibility reverse contrast display with automatic backlight adjustment and optical sensor for optimal viewing in all lighting conditions

Safety and Durability Features

  • CAT III 600V Safety Rating - Meets rigorous safety standards for electrical testing in controlled electromagnetic environments including residential, business, and light-industrial locations
  • Lead-Alert Protection System - Features LED indicators for proper test lead placement, preventing measurement errors and enhancing user safety during electrical testing
  • Drop Protection Design - Durable meter construction withstands 6.6-foot (2m) drops, ensuring reliable performance in demanding work environments with Klein Tools quality standards

User-Friendly Operation

  • Slim Profile Design - Compact dimensions (6.5" x 3.15" x 1.09") allow multimeter to conveniently fit into most pockets while maintaining full functionality
  • Auto Power-Off and Data-Hold - Conserves battery life with automatic shut-off feature and data-hold function for recording measurements, plus low battery indicator for maintenance alerts
  • Min/Max Measurements - Captures minimum and maximum readings for monitoring fluctuating electrical conditions and troubleshooting intermittent problems

Technical Specifications

Voltage Range: 600V AC/DC, Current Capacity: 10A AC/DC, Resistance: 50MΩ, Temperature Range: -40° to 1832°F (-40° to 1000°C), Capacitance: 400 µF, Frequency: 1 Hz to 50 KHz, Display: 4000 Count LCD with automatic backlight, Safety Rating: CAT III 600V, Drop Protection: 6.6' (2m), Dimensions: 6.5" L x 3.15" W x 1.09" H, Weight: 0.58 lbs, Power: 2 x AAA batteries, Construction: ABS with electrical components, Color: Orange/Black professional finish.

Installation & Usage

  1. Verify meter operation by testing known voltage source before each use, ensuring accurate readings and safe operation
  2. Connect safety-rated test leads to appropriate input jacks, following Lead-Alert LED indicators for proper placement
  3. Select measurement function using rotary switch, allowing auto-ranging to automatically determine optimal measurement range
  4. Apply test leads to circuit or component, observing proper safety procedures and maintaining safe working distances
  5. Read measurement on high-visibility LCD display, using data-hold function to capture readings as needed
  6. For temperature measurements, connect thermocouple adapter and probe to measure surface or ambient temperatures accurately

Professional Applications

Ideal for:

  • Electrical Installation and Maintenance - Voltage verification, current measurement, and continuity testing for residential and commercial electrical systems
  • HVAC System Troubleshooting - Temperature measurement and electrical component testing for heating, ventilation, and air conditioning equipment
  • Industrial Equipment Maintenance - Motor testing, control circuit analysis, and electrical component verification in manufacturing environments
  • Telecommunications Installation - Cable testing, signal verification, and electrical measurements for communication system installation and repair
  • Automotive Electrical Diagnosis - Battery testing, charging system analysis, and electrical component troubleshooting for vehicle maintenance
  • Construction Site Testing - Temporary power verification, electrical safety checks, and equipment testing for construction electrical work
  • Residential Service Calls - Outlet testing, circuit analysis, and electrical troubleshooting for home electrical problems and safety inspections
  • Commercial Electrical Maintenance - Panel testing, load analysis, and electrical system maintenance for office buildings and retail facilities

True RMS Technology Advantage

Klein Tools True RMS (Root Mean Square) technology provides superior accuracy when measuring AC voltage and current in non-linear loads such as variable frequency drives, electronic ballasts, and switching power supplies. This advanced measurement capability ensures precise readings in modern electrical environments where standard averaging meters may provide inaccurate results, delivering the professional-grade performance electrical contractors require.

Why Choose Klein Tools Quality?

Since 1857, Klein Tools has maintained its commitment to manufacturing America's finest electrical testing equipment, combining traditional craftsmanship with cutting-edge technology. Each digital multimeter undergoes rigorous testing protocols to meet stringent safety standards and durability requirements, ensuring reliable performance in demanding electrical environments. Klein Tools' dedication to electrical professional safety, precision engineering, and innovative design makes this TRMS auto-ranging multimeter the trusted choice for electricians, technicians, and contractors who demand accuracy and reliability in their electrical testing equipment.



KLN-MM450 - spec sheet

Manufacturer Resources

Product Specs

Accuracy:
See Instructions
Application:
Testing and Measuring Voltage
Batteries:
2 x AAA
Capacitance:
400 µF
Color:
Orange/Black
Current:
10A AC/DC
Depth:
6.5000 in
Display:
4000 Count LCD
Drop Protection:
6.6' (2 m)
Frequency:
1 Hz to 50 KHz
Height:
1.0900 in
Included:
Multimeter; Carrying Pouch; Test Leads; Thermocouple with Adapter; Batteries
Material:
ABS, Electrical Components
Ohms Resistance:
50 MΩ
Overall Height:
1.09" (2.8 cm)
Overall Length:
6.5" (16.5 cm)
Overall Width:
3.14" (8 cm)
Standard:
CAT III 600V; CE and UKCA Certified
Temperature Range:
-40° to 1832°F (-40° to 1000°C)
Type:
Digital Multimeter
Weight:
0.5750 lbs
Width:
3.1500 in
Category:
Multimeters
Product Type:
Digital Multimeter
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Electrical Testers
Product Voltage:
600V AC/DC
Product Function:
Measures up to 600V AC/DC Voltage, 10A AC/DC Current and 50MΩ Resistance, Temperature, Capacitance, Frequency, Duty-Cycle, Test Diodes and Continuity

Klein Tools MM450 – Frequently Asked Questions

How fast can I get the Klein Tools MM450 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools MM450 come with a warranty?
Absolutely. The Klein Tools MM450 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools MM450?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools MM450 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.