* New Mini Digital Voltmeter 4.5-30V Red LED Auto Car Truck Vehicles Motor Voltage Volt Panel Gauge Meter. * Operating voltage: 4.5 ~ 30V Operating Current: 60ma display:="" 0.56="" "led,="" red="" * Mounting holes: 45.5 x 26.5 mm. * Measurement rate: 500mS. * Measurement accuracy: 1%. * Maximum operating conditions: Minimum operating voltage: +4.5 V Maximum operating voltage: +30 V. * Operating temperature: -10 to +65 C. * Operating Humidity: 10 ~ 80% (no condensation). * Working pressure: 80 ~ 106kPa . * Sun exposure: no direct exposure . * Color: Black. * Item size: 48 x 28 x 22 mm.