GFM-300A-DM 120V:

SKU: 00-300A-DM 120V

Ground Continuity Tester, 3-300A Output with Digital meters.


Ground Continuity Tester
Ground Continuity Tester, 3-300A Output with Digital meters. $5,090.00

Designed & Built in the USA

  • 1-Year Warranty
  • 100% Secure Checkout
Guaranteed Safe Checkout

The GFM-300AC is designed for testing where very high currents are needed to judge connection resistance. The front panel allows adjustment of the AC current up to 300A with a max load of 0.010Ω. The dual digital meter front panel simultaneously displays both current through and voltage across the grounding circuit of the unit under test. Provided with premium leads and alligators, manual and calibration certificate.

Built in the USA. Email and phone support free for life.


  • AC output – constant current delivers up to 300A at up to 3.75V for ground resistance measurements of up to .010 ohms. Current is adjustable from the front panel.
  • Digital meters indicates output current and voltage.
  • Output breaker switch on front panel.
  • Four wire voltage measurement for accuracy.
  • Rear panel outputs for safety.
  • Premium test leads included.
  • Large knob for easy adjustment.
  • Calibrated to ANSI Z540 Standards.


Voltage Test Type AC
Output 3-300A – short circuit to 0.010 Ohms
Max Voltage Output 3.75V – open circuit
Current Meter 3-20Aac +/-5%, 20-400Aac +/-2.5%
Voltage Meter 0.37-5Vac +/-1.5%
Operation Temp 15-28 C, 60-95F
Relative Humidity Range 0-90% non-condensing
Input Power Requirements 220V, 50/60 Hz, 5.0A
Dimms 11.25″(W) x 6.75″(H) x 13.00″(L)
Wt 55lbs