LCD Digital Car Auto Cigarette Lighter Voltage Volt Voltmeter Monitor Meter -This digital gauge displays the voltage of batteries in the car. With high brightness of LED there is no difficulty in seeing the display. -Powered by car cigarette lighter charger. -Constantly monitor battery voltage, extend and protect the battery and engine life. -Attention:For DC 12V OR 24V CAR. -Measuring range:DC 8V-30V+/-%1.2. -What kind of batteries is healthy:. When engine running(do not drive), the LED display:. Between 13.5 to 14.5 (12V Car). Between 26.0 to 28.0 (24V Car). -Size:7cm x 4cm x 2.9cm - 2.76inch x 1.57inch x 1.14inch. This is ideal for DIY vehicle repair/maintenance and car repair technicians - We specialize in Electronics, Computer, Cell Phone, Camera, Professional Signal Conversion Devices, Networking, Security, TV Mount, Adapter, Cables and other Accessories Pickup Location: "Cable Link" Tel: 613-680-6188