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Sonel MRU-30 Earth Resistance and Resistivity Tester CAT III


  • earthing resistance using auxiliary electrodes,
  • earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),
  • earthing resistance using double clamps (for measurement of earthing when it is impossible to use auxiliary electrodes),
  • ground resistivity (Wenner method),
  • continuity of equipotential bondings and protective
  • conductors (meeting the requirements IEC 60364) with auto-zero function – with current 200mA.


  • measurement of resistance of auxiliary electrodes RS and RH,  
  • measurement of interference voltage,
  • measurement in the presence of interference voltage in the power network                        
  • with frequency 50Hz, 60Hz,
  • selection of maximum measuring voltage (25V and 50V),
  • introducing the distance between the electrodes for the resistivity in metres (m) and feet (ft),
  • memory of 990 measurements (10 banks of 99 cells each),
  • calibration of clamp used,
  • data transmission to the computer (USB),
  • indication of battery state.


Earth Resistance Testers


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