Features: 1. MULTIMETER: This multifunctional meter can simultaneously measure DC voltage, current, power, charging capacity, time, and other physical quantities; ready to use, no shunt needed. 2. MEASUREMENT RANGE: The digital multimeter measures DC voltage from 0-90V, current from 0-20A, power from 0-9.99KW, capacity from 0-999Ah, and time from 0-99.9 hours. 3. LCD COLOR SCREEN: The voltage current power panel meter features a 1.8-inch LCD color screen, visible even in sunlight; the LCD screen automatically turns off after two minutes if the current is less than 50mA. Press any key to turn it off, or it will automatically wake up when the current exceeds 50mA. 4. DATA STORAGE: The battery tester automatically saves parameters when the display turns off; if the monitoring module also needs to be turned off, press the OK button to save the parameters. 5. BIDIRECTIONAL DETECTION: It's bidirectional, detecting and displaying current for both charging and discharging. Note: It cannot detect current in two directions simultaneously. Parameters: Voltage Measurement Range: Self-powered: DC 10~90V Externally powered: DC 0~90V Current Measurement Range: 0~20A Display Resolution: Voltage: 0.01V Current: 0.01A Time: 0.01H Capacity: 0.01AH Current Accuracy: ± 1% + 2 digits Voltage Accuracy: ± 2% + 5 digits Measurement Frequency: 5 times/second VOP (Over Voltage Protection): 0.01V~90V OPP (Over Power Protection): 0.01W~9.99KW OCP (Over Current Protection): 0.1~100A OAH (Over-AH Protection): 0.01AH~9999AH OFT (Over Time Protection): 0.01H~99.9H Open Hole (mm): 76.5*39.2（mm） Size: 79×43×52(mm) Note: This version does not include a relay, so the LOP (low voltage protection) function cannot be used. We have more detailed user manuals. If you need an electronic manual, please contact us. Package Contents: 1x Multifunctional Meter