Voltage measurement range:0.0V-100V Current test range:0-999mA, 0-10A, 0-50A, 0-100A Power supply range:DC4-30.0V Voltage error:±0.1% Current error:±1% External shunt specifications:75 milliohms Working current< 20mA Refresh rate:About 300mS once Display method:Double three 0.28" LED digital tube Display color:Red + Blue Lead length:15cm Dimensions:48 x 29 x 22 mm Mounting holes:46 x 27 mm Operating temperature:-10°C~65°C