Robust and watertight, the C.A 6460 and C.A 6462 are easy-to-use instruments designed specially for use in the field. Wherever you need to install an electric ground connection or certify an existing one, the C.A 6460 and C.A 6462 help you perform accurate, reliable and quick diagnosis while providing the friendliest and safest test environment. Using the conventional rod-based method, the C.A 6460 and C.A 6462 measure resistivity ("4-wire" connections), ground resistances ("3-wire" connections) and coupling between electrically independent earth electrodes ("4-wire" connections). They are equipped with 4 color-coded terminals for easy connection and a captive bar for changing from a 4-wire to a 3-wire measurement very quickly and easily. Plus, the C.A 6462 is fitted with a rechargeable battery with an internal charger. Once the rods have been installed and connected (named E, ES, S and H), begin measurement by simply pressing the push-button. For maximum accuracy, the range and current selection is carried out automatically. The measurement result and its unity are read directly on the large, backlit digital screen. Three lights indicate any defect or interference liable to impair measurement results: red flashing FAULT LED (E-H): indicates a fault in the current circuit (voltage at terminals ≥ 30 V peak) red flashing HIGH RESISTANCE LED (ES-S): voltage circuit resistance too high (R ≥ 50 kΩ) red flashing HIGH NOISE LED (ES-S): voltage circuit noise ≥ 13 V peak. When it comes to safety, the C.A 6460 and C.A 6462 meet the strictest of standards. These instruments are very suitable to severe environments: parasitic voltages, high telluric currents, highly resistive auxiliary connections, etc.