Feature: 1. Dual Display: Display Voltage and current at the same time; Power supply: DC3.5‑30V; Voltage test range: 0~300V; Current test range: ± 0‑9.99A. 2. Good Consistency: With exquisite SMT process, common ground design, the measurement end and the power supply end ground wire are connected (except for the isolation table). 3. Calibration: Equipped with voltage calibration potentiometer, current calibration potentiometer, if there is an error, you can calibrate it yourself. 4. High Performance: The voltmeter adopts decimal point automatic shift design, which has strong anti interference ability and fast display refresh speed. 5. Practical in Use: Easy to connect, with a wide power supply range of DC3.5‑30V (except for isolation meters), and has power supply with reverse polarity protection. Specification: Item Type: Volt Amp MeterMaterial: ABSParameter: Voltage Range: 300V Test range (v): 0.0-300V, resolution (v): 1V, impedance (Ω) >1M Current Range: 10A Test range (v): +/-0-9.99A, resolution (A): 0.01A Display Mode: 0.28in LED, bicolor (red and blue) Operating Current: <20mA Supply Voltage: Non Isolated Meter: DC3. 5-30V (wide range) Note: The maximum power supply voltage of the non isolated meter should not exceed 30V, otherwise there is a risk of burning..Size: Approx. 48x29x21mm/1.9x1.1x0.8in Mounting Hole: Approx. 45.5x26.5 mm/1.79x1.04in Measurement Accuracy: 1% (±2) Measurement Rate: ≥500mS/time Working Temperature: -10-+50°C Working Air Pressure: 80~106kPa Working Humidity: 10-80% (non-condensing) Sun Exposure: Do not expose directly to the sun Package List: 1 x Volt Amp Meter