Features: The meter head is a common design, i. e. the ground wire at the measuring end is interlinked with the ground wire at the power supply end (except the isolation meter). The meter head is equipped with voltage calibration potentiometer, current calibration potentiometer, if there is any error, you can calibrate it, because the error is absolute. The voltage meter adopts the design of automatic movement of the decimal point. This meter has strong anti-interference ability and fast display refresh rate. The meter head uses a wide power supply range: DC3.5 ~ 30V (except the isolation meter), the power supply reverse connection will not burn. The meter head is equipped with five wiring, the connection is convenient, it is used to monitor the voltage of the battery, to grasp the voltage state of the battery in time, and to measure the voltage and current of other products. Specification: Voltage Measuring Range 0~99.9V Resolution 0.01V(