Two-way current detection allows users to monitor charge and discharge automatically without changing wiring direction. Power-off memory function retains the AH value before power loss for convenient observation and measurement. Time and AH reset function does not interfere with ongoing measurements. AH counting continues during discharge without affecting accuracy. Includes protection features such as overvoltage, overcurrent, overpower, time limit, and overcharge protection. Simultaneously displays voltage, current, charging capacity (AH), energy (WH), time, and power. Information is comprehensive and clearly presented. Current is measured using a Hall sensor. The current-carrying wire passes through the sensor's round hole, enabling safe and convenient detection in both positive and negative directions. This volt-ampere meter is designed to measure voltage, current, charge/discharge capacity, time, and power. It features a color LCD screen that provides clear and detailed readings. Equipped with a Hall sensor for non-invasive current measurement, it is ideal for monitoring battery charge/discharge processes and output voltage and current. Current measurement range: 0500A Display resolution: 0.2A Voltage measurement range: 1290V (self-powered), 090V (external power) Current accuracy: 3% 5 digits Voltage accuracy: 2% 5 digits Voltage resolution: 0.01V Capacity resolution: 0.01AH Time resolution: 0.01H (1 minute) Measurement rate: 5 times per second OVP (Overvoltage Protection): 0.0190V OPP (Overpower Protection): 0.01W9.99kW UVP (Undervoltage Protection): 0.0190V OCP (Overcurrent Protection): 0.1100A OCP (Overcharge Protection): 0.019999AH OFT (Overtime Protection): 1 minute99 hours 59 minutes Color: Black Material: Plastic Size: 7.9 x 4.3 x 5.2 cm Package Contents: 1 x Voltage and Current Meter Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error allowed is 13 cm.