FOR AUTOMOBILE: this dc ammeter can be used as battery charge-discharge tester meter for automobile and car battery MULTIMETER: DC multimeter can measure and display voltage (0-90V), current (0-100A), power, battery capacity, amp-hour, watt-hour and time simultaneously BIDIRECTIONAL AMMETER: the multimeter can detect current in dual direction without changing the wiring direction when used for monitoring charging and discharging PROTECTION: DC multimeter built in over-voltage protection, over-current protection, over-power protection, over-charged protection, time limitation, etc APPLICATION: this DC ammeter can be used as battery capacity monitor for photovoltaic system; as voltage meter, current meter, power meter, etc Description This DC ammeter built in LCD color display; AH power off memorized function; time and AH resettable; calibration function; automatically / manually switch off LCD screen; with output control button to enable / disable output (requires a relay). Pass the wire that transports current through the round hole of the hall sensor, then the current will be detected. The current can be detected in both positive and negative directions, which is safe and convenient. Features DC ammeter -Color: As shown. -Material: Plastic. -Size: 13x8x9 cm/5.12x3.15x3.54 inch. Protection Function Menu: OVP (Over-voltage protection): 0.01V-90V OCP(Over-current protection): 0.1-100A OPP(Over-power protection): 0.01W-9.99KW LOP(Low-voltage protection): 0.01V-90V OAH(Over-charge protection): 0.01AH-9999AH OFT(Over-time protection): 1min-99hour59min NOTE: 1. Do remember to correctly wire the hall sensor, power supply and load according to the instruction. 2. Check the jumper connection, which needs to be connected on J4 when no extra power supply for the hall sensor, while on J3 with an extra power supply added to the hall sensor. If the relay (this product doesn't contain a relay) is connected, press the button to move the yellow cursor to OUT after powering on, and press OK to control the output. If the OUT light turns green, the output will be turned on; if the OUT light is gray, the output will be turned off. And the power state of the machine will be the state before the last shutdown. If the relay is not used, the output is always on and the OUT light won't work. Package Including 1 * DC ammeter1 * Coulombmeter