DC Digital Multi-function Meter Model: PZEM-025 A.Function Measure DC voltage, current, power, energy and display with LCD. B.Display I. Display interface HTN wide view LCD: voltage + current + power + energy + green backlight(See Figure 1). Display instruction 1.Voltage Measurement range: 0300V(Independent power supply: DC 5-12V)/8-300V(Direct power supply) Display format:4.Energy Indication Energy has direction indication, if there is -, it means the energy is reverse direction, otherwise it is forward direction. The energy direction is judged according to the current direction, If the current is positive, the energy will increase, maximum is 999kwh, overflow will be maintained, unle you reset it; if the current is reverse, the energy will decrease, maximum is -999kwh, overflow will be maintained, unle you reset it (See Figure 2) 5.Working Mode Direct power supply: Direct supply by test voltage, test range is: 8-300V Independent power supply: Working voltage range is: DC5-12V, test range is:0-300V(See Figure 3)6.Data Preservation Energy data and backlight state can be saved when power off. D.Wiring DiagramE. Dimension DiagrammmF. Attention 1. This product is suitable for indoor use. 2. This product is suitable for DC. 3. The measurement voltage and ampere shall not exceed the calibration range. 4. Make sure the wiring is correct.