JZK 2 wire DC 7-100V 0.56″ mini digital red LED volt display voltmeter panel voltage meter – – Product Features: – Support 36V / 48V / 60V / 72V / 84 Velectric cars. – Can be used for measuring the car / battery car / motorcycle battery voltage, and other forms of voltage. – Can be used in all kinds of voltage measurement purposes. – With reverse polarity protection, Avoid Reverse connection Damage. – – Technical Parameters: – – Physical size: 48 x 29 x 22 mm (L*W* H) – Opening size: 45 x 26 mm (L*W) – Lead wire length: 14 cm (2 wires) – Weight: 19.5g – Display color: Red – Display mode: Three 0.56 LED digital tube – Update rate: About 500 ms / time – Input range: 7- 100V – Power supply: No need power supply – The minimum input: 7V (Below this voltage,it will show measurement inaccurate, or don’t show). – The maximum input: 100V (please do not exceed 30V, otherwise, the meter would be damaged. – Measurement range: DC 7.0 – 100V – Operation temperature: -10 degrees~65 degrees – Measurement accuracy: ± (1% + 1 Digit) – Red line: Power Supply +, Measure Voltage +(7-100V ) – Black line: Power Supply -, Measure Voltage – – – NOTE:The voltmeter is not used to the electric motor which has reverse gear. Because the power can produce high induction voltage when switching the reverse gear. And the voltmeter cannot bear on it. All metal of the motor cannot connect with the metal sink in case of causing shorting.