• 400A AC & DC current
  • AC/DC voltage: 600V
  • DC µA current: 4000µA
  • Resistance: 40.000MΩ
  • Capacitance: 10pF to 40,000µF
  • Frequency: 40MHz
  • Basic accuracy: ±1.5%
  • Temperature (type-K): -58 to 1832°F
  • Temperature (IR): -58 to 518°F
  • 8 to 1 distance to target ratio
  • Dual thermocouple inputs with differential function
  • Built-in non-contact Voltage detector with LED alert
  • Measures motor capacitors to 40,000µF
  • 1.25" (32mm) jaw opening for conductors up to 500MCM
  • Auto power off with audible alert and disable function
  • Autoranging with manual override

What's in the Box

  • Double molded test leads (CAT III-600V)
  • 9V battery
  • 2 type-K bead wire probes
  • Carrying case


The Extech EX 623 dual input clamp meter is 400A clamp-on True RMS multimeters with non-contact infrared temperature measurement. They are ideally suited for residential electricians, HVAC professionals, and light industrial maintenance technicians. They are versatile instruments capable of accurate measurements of AC current, AC/DC voltage, resistance, capacitance, frequency and temperature via dual type-k thermocouple input.

The Extech EX623 clamp meters are constructed of rugged double molded housing and feature 1.25" jaws which are large enough to accommodate conductors up to 500 MCM. Readings are displayed on a large LCD with a 40,000 count to offer high resolution over wider ranges. Other features include Data Hold and Peak Hold features to allow capture of current surges during motor start-up and other electrical transients, DC µA multimeter function for HVAC flame rod Current measurements, auto power off with audible alert and disable function, non-contact voltage detector with LED alert, and autoranging with manual override.

The Extech EX622 was the AC only version and has been discontinued.

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