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Electrical Testing Tools
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.
Features
- Multimeter with automatic ranging true root mean square (TRMS) technology for increased accuracy
- 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 protection with LED illumination for lead placement and an easy-to-view backlit display
- Low battery indicator and easily accessible battery and fuse compartment
- Durable meter built to withstand a 6.6-Foot (2 m) drop
- Includes test leads, thermocouple with adapter, batteries and user manual
- CAT III 600V safety rating
- For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations
- Lead-Alert; Auto-Range; Min/Max Measurements; Backlight; Auto Power-Off; Data-Hold
Specifications
Standard | CAT III 600V; CE and UKCA Certified |
Overall Height | 1.78" (4.5 cm) |
Included | Multimeter, Test Leads with CAT III/CAT IV Safety Caps, Thermocouple, Instructions, 2 x AAA Batteries |
Voltage | 600V AC/DC |
Overall Length | 6.41" (16.2 cm) |
Ohms (Resistance) | 50M |
Type | Digital Multimeter |
Temperature Range | -40° to 1832°F (-40° to 1000°C) |
Current | 10A AC/DC |
Frequency | 1 Hz - 50 KHz |
Material | ABS, Electrical Components |
Functions | Measures up to 600V AC/DC Voltage, 10A AC/DC Current, 50M Resistance, Temperature, Capacitance, Frequency, Duty-Cycle, Test Diodes, and Continuity |
Color | Orange/Black |
Capacitance | 400 µF |
Display | 4000 Count LCD |
Application | Testing and Measuring Voltage |
Batteries | 2 x AAA |
Overall Width | 3.16" (8 cm) |
Drop Protection | 6.6' (2 m) |
Accuracy | See Instructions |
Height | 3.8200 in |
Width | 5.0800 in |
Depth | 9.3300 in |
Weight | 0.9100 lbs |
Item#:
MM420
Manufacturer Item:
MM420
Your Price:
72.99
Each
Features
- Voltage tester provides non-contact detection of AC voltage
- Volt pen detects 12 to 1000V AC with simultaneous visual and audible voltage indicators
- Bright flashlight illuminates work area and may be used independent of voltage detection function
- Visual LED bar graph indicates the presence of voltage - the higher the voltage sensed, or the closer to the voltage source, the more LEDs light up
- Bar graph visual voltage indicator utilizes up to five vibrant LEDs for easy interpretation/viewing
- Audible voltage indicator beeps at a greater frequency the higher the voltage that is sensed, or the closer to the voltage source
- Auto Power-Off" conserves and extends battery life
- Screw-thread battery cap with O-ring ensures protection against dust and water ingress
- Lightweight, compact tool with pocket clip provides convenient storage and quick access
- IP67: Dustproof and waterproof
- 6.6 feet / 2 meter drop protection
- CAT IV safety rating for 1000V
- Conforms to CE requirements
- US Patent 10,073,142, D750,985 and other patents pending
Specifications
Overall Height | 1.16" (2.9 cm) |
Overall Width | 0.72" (1.8 cm) |
Voltage | 12 - 1000V AC |
Frequency | 50 - 500 Hz |
Pollution Degree | 2 |
Weight | 1.20 oz (34.00 g) |
Overall Length | 5.83" (14.8 cm) |
Special Features | US Patent 10,073,142, D750,985 and Other Patents Pending |
Standard | CAT IV 1000V |
Ingress Protection | IP67: Dustproof and Waterproof |
Batteries | 2 x AAA |
Drop Protection | 6.6' (2 m) |
Style Name | with Flashlight |
Your Price:
28.89
Each

Our team of experts is continually trained for the most up-to-date technology available on the field. So, If you have any questions about what cordless power tool would work best for your application, we have an answer. Simply call us at 1-888-595-4411 or fill out our contact form above. We are here to help you get the job done right.