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Parameters: Measuring range: DC 4.5-150V The minimum input: DC 4.5V (if the input is lower than 4.5V, there is incorrect measuring or no display) The maximum input: DC 150V (if the input is higher than 150V, the meter may burn) Allowable tolerance: 1% (+/- 1 digit) Refresh speed: about 200mS evry time Power supply: don't need power supply Current consumption: Working temperature: -10℃~65℃ Display way: 3-digits 0.56″ LED digital tube Length of lead wire: 20cm Opening size: 46 * 27mm Dimension: 48 * 29 * 22mm Weight: 24g Features: 1.This voltmeter adopts totally enclosed frame and waterproof embedment design, which means that it will still work normally when immersed in water for a long time, moreover, it is moistureproof, greasy dirt-proof and anti-vibration. 2. The measuring range of this meter is DC 4.5-150V, so it is suitable for all electrombile and storage battery car whose voltage is 12V/24V/36V/48V/60V/72V/80V/96V and so on. It also can be used to measure other voltage. 3. This meter is equipped with 2 wires, so it is convenient to connect to car/storage battery car/motorcycle inside circuit; it has function of reverse polarity protection, so it will not burn when connected reversely. 4.The measurement accuracy can be adjusted automatically; the resolution rate will be 0.1V on the conditon of under 100V and be 1V on the condition of over 100V. Package includes: 1 x DC Digital Voltmeter