Battery Operated, 6V DC. Long Jaw Size 65mm x 32mm. suitable for flat metel strips used for earthing. Measures Earth resistance in 1 Sec. Double insulation and protect from external magnetic as well as electric field. Low Battery Indication. Power Consumption: Approx. 5mW, 50 hours continuous. Simple, Time saving & Valuable. Measures earth resistance in 1 Second. Forget conventional method of isolation of earth pits for measurement. Stakeless testing, saves time in measuring earth resistance of mesh earth pits