Features:
Powered by car cigarette lighter charger (DC 12~24 V)
When engine running (do not drive),the LED dispaly:
Between 13.5 TO 14.5 (12V CAR)
Between 26.0 TO 28.0 (24V CAR)
With the engine off, and nothing turned on,the LED dispaly:
Greater than 12.0 (12V CAR) OR 24.0 (24V CAR)(for reference only)
Measuring range :  DC 8V-30V±%1.2
Installation: insert the jack of the product into a cigar socket
LED Display Cigarette Lighter Electric Voltage Meter For Auto Car Battery
Car battery voltage display
With high brightness of LED(light-emitting diode) there is no difficulity in seeing the display.
With high brightness of LED there is no difficulty in seeing the display
This digital gauge displays the voltage of batteries in the car.
Installment:
Clean the cigar socket.
Insert the jack of the product into a cigar socket.

Specifications:
Net weight:22g
Package weight:33g

Packing content:
1 x Electric Voltage Meter