This device can help you diagnose the source of your car's electrical problems and potentially save you a lot of money. It simply plugs into your car's cigarette lighter socket and will present you with alternator and battery status.
• Alternator status: Red LED: Too high >14.8VGreen LED: Normal 13.4-14.75VYellow LED: Too low <13.2V
• Battery status:Green LED: Charged 12.4-12.6VYellow LED: Recharge 11.8-12.35VRed LED: Dead <11.75V
• Compatible with 12VDC systems
• Dimensions: 85(L) x 75(W) x 15(D)mm