2 in 1 digital display for car battery voltage and temperature - Combines a voltmeter and thermometer in a single unit. Displays the vehicle battery voltage and the vehicle temperature at the same time for quick, at a glance readings. Compatible with 12V and 24V systems - Suitable for most cars, trucks, and other vehicles with DC 12V or 24V electrical systems. Temperature sensing with external flexible sensor - Includes an external flexible temperature sensor for accurate placement. Temperature range is -10 C to 80 C. Safe and reliable operation - Built in fuse provides safe operation. Designed for continuous use without battery installation. Plug and play power - No internal battery required. Simply plug into the cigarette lighter socket to power the device. Compact and easy to install - Small, plug and play design that fits in any cab setup without clutter. Practical use scenarios - Daily drivers: monitor battery health and cabin temperature to ensure comfort and detect potential battery issues early. - Extreme weather: keep an eye on voltage levels during very hot or very cold days to reduce starting problems. - Long trips or fleet vehicles: track voltage stability and cabin conditions to prevent unexpected breakdowns and improve reliability. Key attributes at a glance - Function: voltmeter and thermometer in one digital display - Compatibility: DC 12V and 24V systems - Display: simultaneous readings of battery voltage and vehicle temperature - Sensor: external flexible temperature sensor (-10 C to 80 C) - Safety: built in fuse - Power: plug into cigarette lighter; no battery required - Design: compact, plug and play for easy installation