2 in 1 Current Voltage Meter 300V 20A Dual Digital Display LED Volt Amp Tester Gauge for Vehicles Item Type: Volt Amp Meter Material: ABS Test Voltage Range: Range: 300V, Test Range (V): 0.0-300V, Resolution (V): 1V, Resistance (Ω)>1M Test Current Range: Range 20A, Test Range (A):+/-0.10-20A, Resolution (A): 0.1A Size: Approx. 70 x 40 x 30mm / 2.76 x 1.57 x 1.18in Installation Hole Diameter: Approx. 68 x 38mm / 2.68 x 1.5in Measurement Accuracy: 1% (± 2 Bits) Measurement Rate: ≥ 500mS/Time Zeroing Calibration: In order to obtain more accurate measurement, it is recommended to power on preheat for more than 5 minutes before zeroing calibration. Working Environment: Please try not to install the meter head and current transformer around high temperature, strong magnetic field and large transformer, otherwise it will affect the accuracy. Working Current:<30mA Power Supply Voltage: DC 4-30V Working Temperature: - 10-+65 ℃ Working Humidity: 10-80% (No Condensation) Working Pressure: 80-106kPa Exposure To The Sun: Direct exposure is not allowed Display Mode: Full three 2 x 0.39in LED, voltage red word, current green word