shockley RED 3 Wire Calibratable 0-100V 0.28" Mini DC Voltmeter LED Display (2 Pc) Voltmeter  (Digital)

Description Detection voltage: 0~100V Working voltage: DC 4~30V Operating current: Less than 20mA Display mode: 0.28" LED, red, blue, green, yellow (multicolor options) External dimensions: 30×10×8 mm (length ? width ? height) Installation opening: 23×10 mm Measurement rate: ?200mS/time Measurement accuracy: 3‰ Low working voltage: +4V Maximum working voltage: +30V Working temperature: -10?+65? Working humidity: 10?80% (no condensation) Working pressure: 80?106kPa Sunlight exposure: no direct exposure Features Three-wire Range DC 0-100V, 3-wire can work directly in 5V, 9V, 12V, 24V and other circuits, without voltage regulation. With three wire, easy access to the car, motorcycle car wiring, with reverse protection function. Used to monitor the battery voltage, timely grasp the battery voltage state, can also be used for other products voltage measurement purposes. 3-wire voltage meter with reverse polarity protection and accurate pressure measurement. Note: The three-wire voltage range of 0-100V, can also be used for the second line but the voltage should be within 30V