Feature: 1. Easy Calibration: This meter uses SMT technology for good consistency. It includes a calibration potentiometer and zero adjustment potentiometer, allowing self-calibration in case of measurement deviation. 2. Simple and Safe Operation: The current sensor features a through-hole design, enabling the wire to pass directly through without altering or damaging the original circuit. 3. Isolated Design: The current sensor is electrically isolated from the measured wire, allowing safe measurement of current on positive, negative, or any line. Voltage withstand capacity up to 2kV between measured wires. 4. Forward and Reverse Current Measurement: The ammeter measures both forward and reverse current. Positive current is displayed with steady decimal point; negative current is indicated by a slowly flashing decimal point. 5. Wide Applications: Includes two connection wires for easy integration into solar power systems, cars, battery-powered vehicles, and motorcycles. Monitor battery charge and discharge status effectively. Suitable for various other applications. Specification: Item Type: Digital Ammeter Material: ABS Current Range: 0.0-50A Resolution: 0.1A Power Supply Voltage: 4-30V (Wide Range) Note: Maximum input voltage must not exceed 30V to prevent damage Display Mode: 0.52in LED, Red External Dimension: Approx. 54 x 30 x 21mm / 2.13 x 1.18 x 0.83in Installation Opening: Approx. 47.2 x 27.3mm / 1.86 x 1.07in Measurement Rate: 500ms/Time Measurement Accuracy: ±1% Power Supply Lead Length: Approx. 150mm / 5.91in Transformer Lead Length: Approx. 150mm / 5.91in Minimum Supply Voltage: +4.0V Maximum Supply Voltage: +30V Working Temperature: -10°C to +65°C Working Humidity: 10-80% RH (non-condensing) Operating Pressure: 80-106kPa Sun Exposure: Do not expose to direct sunlight Calibration Method: To ensure accuracy, calibration can be performed due to component aging or environmental changes over time. Preheat the device for at least 5 minutes before calibration. Zero Calibration: With no current applied, adjust the zero potentiometer using a slotted screwdriver until the decimal point flashes rapidly—this is the optimal zero point. Constant light or no light indicates a positive offset; slow flashing indicates a negative offset. Current Calibration: Apply half of the full-scale current, then adjust the amplitude potentiometer on the transformer side until the reading matches a standard reference meter. Repeat both steps if necessary for higher accuracy. Package List: 1 x Digital Ammeter