DC 12V 24V Digital LED Voltmeter, Waterproof Battery Tester with Reverse Polarity Protection for Car, Motorcycle, Truck, Boat, Blue

2-in-1 Function: The car LED voltmeter monitors DC voltage 5–48V and charge status 0–100% with ±0.1 accuracy, allowing real-time monitoring of battery status. Wide Compatibility: The 12V voltmeter is compatible with cars, boats, motorcycles, trucks, RVs, SUVs, ATVs, UTVs, tractors, off-road vehicles, and 12V, 24V, and 36V DC systems. Multiple Protections: The DC voltmeter incorporates a 10A fuse for overload, overcurrent, and short-circuit protection, with reverse polarity protection for safe use. Touch Switch: The 12V battery charge indicator switch controls the power and toggles between voltage and capacity, turning off when inactive to save energy. 2 Mounting Modes: The battery tester installs in a 30mm hole, with or without a panel. The red cable connects to the positive terminal, the black cable to the negative terminal. Electrical Safety for DIY Projects: The battery capacity monitor with a 10A fuse provides protection against overload, overcurrent, short circuit, and reverse polarity.