Produino ST Master Chip 0.56" LED 3-Digital DC Voltmeter - Black (3.5~30V)
Technical parameters: Measuring range: 3.5~30V Minimum input: below the minimum voltage measurement inaccurate or does not show Maximum input: DC 18V (This voltage is higher than the risk of burnt) Tolerance: tolerance of 1% (+ / -1 words) Display: three 0.56" LED digital tube Display color: red Refresh rate: about 500mS / times Power supply: no power Current consumption: less than 20mA typically 5~15mA Working temperature: -10C~65C