This Extech Clamp-On Ground Tester simplifies ground resistance measurements on multiple-point ground systems. Use to verify the resistance of cellular and communication tower ground grids, check utility transmission systems and grounding rods, perform maintenance on electrical transportation systems. Ideal for grounding systems in sub-stations, factories and office buildings. Resistance 0.030hm-15,000hm, Battery Included Yes, Display Type High-contrast LCD, Jaw Opening in. 0.9. Ground resistance measurements down to 0.03 with 0.02 maximum resistance True RMS AC leakage current range of 0.2mA to 15A with 0.001mA maximum resolution Rotary switch operation Electrical noise detection Verification resistors confirm accuracy of meter Data hold and continuity beeper Automatic self-calibration on start up
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