The product uses the Hall principle to detect current. It is recommended to keep at least 15 cm away from magnetic objects during use, otherwise the current accuracy will be affected. Usage Method When using or replacing the battery for times, you must correctly set the actual effective battery capacity (CAP value in the setting interface). If the actual battery capacity is known, enter the setting interface to enter the CAP capacity, and then exit the setting interface. After the battery is fully charged, press and hold the + button on the capacity display interface to set the full capacity. If the actual battery capacity is unknown, you need to follow the steps below to enter the setting interface and set the CAP capacity value to a high value, much higher than your battery capacity (for example, is your estimated battery capacity? The capacity is 20AH, which can be set to 30AH). Empty the battery and set the capacity meter to zero (press and hold the - button on the capacity