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  • Ground resistance measurements down to 0.03Ω with 0.002Ω maximum resolution
  • True RMS AC leakage current range of 0.2mA to 30A with 1.000mA max resolution
  • Programmable data logging with 116 data points
  • Programmable Hi/Lo alarm
  • 0.9" jaw size for large ground rods
  • Automatic self calibration when powered on
  • 9999 count high contrast LCD display
  • Included resistance checkplate confirms meter accuracy
  • Electrical noise detection feature prevents inaccurate readings
  • Data hold and continuity beeper

What's in the Box

  • 9V battery
  • Resistance check plate
  • Metal storage case


The Extech 382357 clamp-on ground resistance tester allows the user to measure ground resistance without the use of auxiliary ground rods. The Extech 382357 clamp-on ground resistance tester measures resistance from 0.03Ω to 1500Ω and True RMS AC Leakage current from 0.2mA to 30.00A. The Extech 382357 clamp-on ground resistance tester features programmable data logging with 116 points, programmable hi/lo alarms, 0.9" jaw size, self-calibration when powered on, and verification resistors to confirm the accuracy of the meter.

Applications for the Extech 382357 Clamp-On Ground Resistance Tester

  • Verify resistance of cellular and communication tower ground grids
  • Check utility transmission systems and grounding rods
  • Maintenance on electric transportation systems
  • Ideal for grounding systems in sub-stations, factories and office buildings