Power Supply (Measure Voltage): DC 4.5-30V Measure Voltage Range:0-100v Measure voltage < 10V,Min Resolution: 0.01V Measure voltage >10V, Min resolution: 0.1V Measure Current: 100A forward current ( more than 10A need shunt) Current Resolution: 0.01A Operating Current: <20mA Display: 0.28 "LED monochrome（red and red) Dimensions: 48 x 29 x 21 mm Cutting Size: 45 x 26 mm Measurement rate: ≥ 500mS / times Accuracy: 1{7e82c6d62784066d1b113f595afb6e15f0ca3fec289cddd29e600df910d44428} (± 1 digit ) Operating Temperature: -10°c ~ +65°c Operating Humidity: 10 ~ 80{7e82c6d62784066d1b113f595afb6e15f0ca3fec289cddd29e600df910d44428} (non-condensing) Working pressure: 80 ~ 106kP