The Sonel MRU-30 uses most known methods of earth resistance measurements. Tests can be performed using the 3-pole, 4-pole, 3-pole with auxiliary clamp and also, additionally, the MRU-30 employs the two clamp method of measurement, without the use of auxiliary test rods which can't be used in some situations. Complementary features of the MRU-30 are measurements of soil resistivity, continuity measurement of protective and equipotential conductors and, using clamps, leakage currents and interference voltages.

• Robust and weatherproof (IP65) - no ingress of dust, water protected by a nozzle against enclosure from any direction.
• Ergonomic casing - small and handy casing to make the measurements more convenient than before.
• Built-in rechargeable battery - saving time to replace flat batteries; can be recharged from Power Bank and Cigarette Lighter Socket!
• Clear on-screen notes - displayed on screen before and after the measurement to alert user of possible dangers and irregularities.
• Many measurement methods available in a small, portable casing.

It allows to take the measurements of:

• earthing resistance using auxiliary electrodes,
• earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),
• earthing resistance using double clamps for measuring multiple earthing without underground connections.
• ground resistivity (Wenner method),
• continuity of equipotential bondings and protective
• conductors (meeting the requirements IEC 60364) with auto-zero function – with current 200mA.

Additionally:

• 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.