Low Current Clamp On Ammeter, Amperage Rating: AC DC: 4 AMP, 40 AMP, Frequency Rating: 40 HZ - 400 HZ In AC, Measuring Range: 0 - 40 AMP DC Or AC Peak, Operating Temperature: 0 - 50 DEG C, Dimensions: 184 MM Length X 71 MM Width X 31 MM Height, Battery Type: 9 V, Alkaline PP3, NEDA 1604, Display: 40