• Maximum AC current of 600A
  • Measure AC current, AC/DC voltage and resistance
  • Data hold "freezes" data in display
  • 1.25" (33mm) circular jaw opening for large cables (350MCM)
  • Peak hold captures in-rush currents
  • Audible continuity beeper
  • Auto power off


The Extech 38387/38389 clamp on ammeter measure AC current, AC/DC voltage, and resistance. These clamp on ammeters have a 1.25" circular jaw opening for measuring large cables. The data hold feature "freezes" data in the display, and the peak hold feature captures in-rush currents.

The Extech 38387/38389 clamp on ammeter ships complete with test leads, 9V battery, and belt holster.

These clamp on ammeters from Extech feature an audible continuity beeper, in which a tone will sound if the resistance is less than 40Ω.

Features of the Extech 38387 Clamp On Ammeter

  • ±1.5% AC current accuracy
  • AC/DC Voltage: 1V - 600V
  • 2000 count LCD display

Features of the Extech 38389 Clamp On Ammeter

  • True RMS voltage and current measurements
  • DC/AC current: 0.1A-600A
  • DC Voltage: 0.1mV-600V
  • AC Voltage: 1mV-600V
  • 4000 count LCD display