Supply voltage: DC4.5~30V Ammeter range: 10A (with overcurrent protection)Working current: <30mA Weight: 17.5g/0.62oz Display mode: 3 digits 0.56in Size: Approx. 48*22*29mm/1.89*0.87*1.14in (length X width X height) Mounting bore: 45.5*25.5 mm/1.79*1 in Measuring rate: >200Ms Measurement accuracy: 1% Maximum current output: 9.99A Operating temperature: 1~+65°C Working humidity: 10~80% (no condensation) Working pressure: 80-106kPa Sun exposure: no direct irradiation