Features: 1. Perforated, isolated, and non-destructive measurements. 2. Positive and negative bidirectional current measurement. 3. Integrated voltage and current, reverse connection protection, prevents damage from reverse polarity. 4. Efficient and stable performance, long working life. 5. Compact size, simple and convenient to use, suitable for a wide range of applications. Specifications: Current range: 50A / 400A / 200A / 100A Current resolution: 0.1A Current accuracy: ±1% Power supply voltage range: DC 5-100V Voltage measurement input range: DC 0-300V Voltage resolution: 0.1V Voltage accuracy: ±1% Installation slot size: 45.5 x 26mm Sensor hole diameter: 20mm Header size: 48 x 29 x 23mm Material: ABS Color: Black Package Contents: 1 x Ampere voltmeter 1 x Shunt 1 x Connection cable 1 x Power cord Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement error allowance is +/- 1-3cm.