<b>Specifications:</b><br> Color: Black<br> Screen digital color: Red<br> Apply for: DC 12V or 24V car<br> Input voltage: 12V/24V<br> Output voltage: DC 12-24V<br> Measuring range: DC 8V-30V+-1.2%<br><br> <b>What kind of batteries is healthy?</b><br> 1.when engine running (do not drive), the LED display:<br> Between 13.5 to 14.5(12V CAR)<br> Between 26.0 to 28.0(24V CAR)<br> 2.With the engine off, and nothing turned on, the LED display:<br> greater than 12.0(12V CAR) OR 24.0(24V CAR)<br><br> <b>Installment:</b><br> Clean the cigar socket.<br> Insert the jack of the product into a cigar socket.<br><br> <b>Advantages:</b><br> With high brightness of LED (light-emitting diode) there is no difficulty in seeing the display.<br> This digital gauge displays the voltage of batteries in the car.<br><br> <b>Package:</b><br> 1 x Electric Voltage Meter