ERT-C seriesClamp Earth Tester

A range of lightweight clamp-on ground resistance testers for Earth Ground loop resistance measurements for commercial, industrial and utility applications. No auxiliary grounding rod is needed, and there is no need to disconnect the ground wire from the grounding rod.

Non-contact, safe and fast.

  • 3 different models available
  • Special clamp shape improves access to Earth cables and straps up to 65mm (models 20C/C+ only)
  • Measures ground leakage current up to 20A (models 20C/C+ only)
  • Automatic self-calibration with auto-ranging
  • Software and advanced memory functionality with download option (20C+ model only)


Clamp Earth Resistance Tester ∅32mm

Order Code: 800115


Clamp Earth Resistance Tester 65x32mm

Order Code: 800020


Clamp Earth Resistance Tester 65x32mm with RS232 and software

Order Code: 800121