Klein Tools®
Digital Multimeter, Auto-Ranging, 600V

Hi-Line Part-Number: KLMM400

Klein Tools KLMM400 is an auto-ranging 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.


  • Measures up to 600V AC/DC voltage, 10A AC/DC current and 40 MΩ resistance
  • CAT III 600V safety rating
  • Built to withstand a 3.3-foot (1 m) drop and withstand daily wear and tear on the job site
  • Low battery indicator and easily accessible battery compartment
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations 
  • Includes test leads, thermocouple with adapter and batteries
  • Batteries: 2 x AAA
  • Drop Protection: 3.3 ft (1 m)
  • Display: 4000 Count LCD
  • Voltage: 600V AC; 600 V DC
  • Frequency: 1Hz - 50 KHz
  • Voltage: 600V AC; 600 V DC
  • Current: 10A AC; 10A DC
  • Capacitance: 200µF
  • Temperature Range: 0° - 1000°F (-18° - 538°C)
  • Overall Length: 6.00'' (152.4 mm)
  • Overall Height: 1.78'' (45.2 mm
  • Overall Width: 3.16'' (80.4 mm)
  • Weight: 0.51 lb (0.23 kg)

Product Video

List Price: Call for Pricing

California Proposition 65

PVC-coated Products; PVC-coated Wires and Cables

WARNING: This product can expose you to chemicals including DINP and/or DEHP, which are known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov or our information page: California Proposition 65.