Jaycar In-Car Battery Monitor & Temperature Display

Your battery's fading and you don't know until it strands you on the M1 at 6am. This plug-and-play monitor sits in your cigarette lighter socket and shows you exactly what's happening — system voltage and ambient temperature, side by side. No wiring. No dash kit. No mechanic. Just plug it in and read the numbers before they become a tow bill. Blue and red LED keeps it readable in full sun or a dark garage at 7am

• Plugs straight into your cigarette lighter socket — no installation needed
• Dual-function display shows battery/system voltage and ambient temperature simultaneously
• Temperature range -10°C to 80°C at 0.1°C resolution
• Bright blue and red LED screen, readable in full sun or a dark garage
• In and out in ten seconds — no wiring, no dash modification