• Automatic ranging true root mean square (TRMS) technology for increased accuracy
• Measures up to 600V AC/DC voltage, 10A AC/DC current, and 50 MΩ resistance
• Measures continuity, temperature, capacitance, frequency, duty cycle, and test diodes
• Lead Alert protection with LED illumination for lead placement
• Easy-to-view backlit display

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 Klein Tools’ development of meters and electrical testers loaded with innovative, time-saving features.

1. 4000-count LCD display

2. Function selector switch

3. 10A jack

4. COM jack

5. VΩ jack

6. Backlight button

7. Range button

8. Max/Min button

9. Hold (data hold) button

10. SEL (select button)

11. Lead alert LEDs