1Safety Improvement: Dc voltage and current are displayed on the same screen. Two wire system has a wide voltage range with reverse connection protection. 2Convenient Operation: Manufactured by exquisite workmanship and equipped with calibration potentiometer, and you can manually calibrate the error. Current sensor is adopted with perforated design, and wire can directly through the hole can detect the current. 3Wide Applicability: You can measure the current of the positive terminal, the negative terminal and a line or device in the line, or you can test the voltage or current of two completely isolated devices. 4High Reliability: Our voltage ammeter has high resistance to current impact, will not be damaged by current impact ammeter. 5Durable Performance: This volt meter has been rigorously tested and has great precision, which could be stably used for a long time.