Greenlee CMGRT-100A Clamp-on Ground Resistance Tester - 1500 Ohm w/Memory


The Greenlee CMGRT-100A Clamp-On Ground Resistance Tester is a hand-held testing device intended to evaluate grounding systems. It has two modes:

  • Standard Mode: Standard Loop Resistance & Leakage Current Measurements
  • Advanced Mode: Refine Measurements to find Impedance at the Selected Frequency & to compute Contact Voltage

Furthermore, it can also give an idea about the integrity of the ground systems, the quality of connections or bonds within the system. The tester can measure Loop Resistance in the range of 0.01 Ω to 1500 Ω as well as leakage current in the range of 0.2 mA to 40A. It comes with a data storage function, that can log up to 300 measurements (Both Ω and/or A). Furthermore, the meter also allows the user to select test frequency between 50, 60, 128, or 2083 Hz.


  • Reads ground resistance down to 0.10 Ω
  • Fully auto-ranging with data hold to capture readings
  • Accessories included: molded carrying case, 9V Alkaline Battery and calibration verification loop
  • Safety:

  • Non-contact voltage indication alerts the operator if voltage is present by an audible tone while displaying a “V” resulting in improved safety precautions
  • Ground circuit remains in service during testing
  • Safety Category: CAT IV, 600V
  • Productivity:

  • Fast and accurate method to measure ground resistance compared to the Fall-of-Potential (FOP) test
  • Dual notification via audible tone and visual alert allows operator to perform tasks in a wide range of environments
  • Performance:

  • Includes three alarms with audio and visual notifications for impedance, voltage, and current to increase operator’s performance
  • Impedance function capable of testing 4 separate frequencies (50Hz, 60Hz, 128Hz, & 2083Hz)
  • Widest operating temperature range (-4 to 131°F) in the industry
  • Made from impact resistant materials resulting in a robust design for the job-site environment
  • Lifetime Limited warranty
More Information
Display Digital
Features Clamp-on
Manufacturer Greenlee
Measurement 1500 Ohms
Rating CAT IV-600V
Type Ground Resistance Testers
Additional Skus CMGRT100A
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