90V 20A Color Dual-Display Voltage Current Meter Charge Discharge Measurement Counter with Relay Features 1. Bidirectional current detection, users who detect charging and discharging can easily detect bidirectional current without changing the wiring direction. 2. Power-off memory function, after power-off, it can memorize the AH number before power-off, which is convenient for observation and measurement. 3. The time and AH number reset function will not affect the next measurement. 4. The number of AH can be topped up without affecting the direct discharge measurement. 5. The voltage, current, charging capacity AH number, WH number, time and power are displayed at the same time, and the display information is comprehensive and clear. 6. With an output shutdown function key, the output can be turned on or off flexibly. 7. With overvoltage, overcurrent, overpower, time limit, overcharge and other protection functions. 8. It can be calibrated online, which is convenient for customers to correct errors in time. 9. When necessary, the liquid crystal display can be turned off to reduce the power consumption of the product. Specifications 1. Voltage measurement range: - Measurement range when self-powered: 10V~90V - Measurement range when externally powered: 0~90V - Input currentoutput current measurement range: 0~20A 2. Display mode Color LCD display 3. Display Resolution - Voltage: 0.01V - Current: 0.01A - Capacity: 0.01AH - Time: 0.01H 4. Accuracy - Voltage: +-1%+2 words - Current: +-2%+5 characters 5. Measurement rate: 5 timessecond 6. Protection type and setting range: - OVP (Over Voltage Protection): 0.01V~90V - OPP (Over Power Protection): 0.01W~9.99KW - LVP (under voltage protection): 0.01V~90V - OCP (Over Current Protection): 0.1~100A - OAH (Overcharged Power Protection): 0.01AH~999AH - OFT (timeout protection) : 0.01 hours~99.9 hours 7. Dimensions (L x W x H): 79 x 43 x 52(mm) 8. Mounting hole opening (mm): 76.5 x