The meter adopts a 0.56 -inch digital tube display with buckle. Convenient to install. This meter can measure 50Hz / 60Hz 70V -- -- -- -- -- 50Hz / 60 hz 380 v ac voltage (average).Streamline design the meter adopts the resistance capacity step-down power supply. Connect directly on the zero line and the line of fire no additional power supply. The touch design when the power supply is not stable/or poor contact header will not burn. Long service life design. LED working current control within 20 ma greatly extended the life of the LED. Global measuring ac voltage range the most widely used after rectifying step-down way first and avoid the instability of rectifier diode error brought about by the pressure drop. Defect is rising costs (increase CBB filtering capacitor. Parameters: working voltage is DC 70V-------DC 380V. Accuracy/error -- -- -- -- -- -- -- -- -- -- - 3%. Display color -- -- -- -- -- -- -- -- -- -- -- -- -- red. Installation hole -- -- -- -- -- -- -- -- -- -- -- -- 45.5 mm x 25.5 mm. Speed: 200 ms/or times. 0.6 "three digital tube. Scope of application: AC 220V mains voltage test. The voltage is 220V generator monitoring. Inverter output of electricity monitoring. Other AC circuit voltage test