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: 4000 Count,10 MM High Characters, Maximum Jaw Opening: 19 MM Cable, Maximum Jaw Opening: 20 MM, Accuracy: Plus-Minus (1.3PCT + 5 Digits), Temperature coefficient: Plus-Minus 0.05PCT Of RDG-DEGC, Resolution: 1 MILAMP In 4 AMP Range, 10 MILAMP In 40 AMP Range, Autoranging: 4 AMP-40 AMP, CE Certified, CAT III 300V