Features: Easy to check the charging situation of the 12V/24V battery in a car, MPV, truck or SUV. Depending on the state of the battery charge, a signal LED indicating "full," "middle," or "low" will light up It has polarity- misconnection protection and overvoltage protection. Car battery tester does not emit light, heat or spark, will not discharge on the battery. With 7 LED indicators, the detector is ideal- for home and business use. 7 LED lights show battery and alternator situation, green for good/full, orange for medium, and red for low. Intuitive-, simple and clear. Without knowing the voltage-, we tell you the quality of the battery and alternator. Analysis of 12V/24V battery and alternator. BM410 battery tester will automatically identify 12V or 24V battery. The tester is suitable for 12V and 24V charging system, such as conventional liquid-filled, AGM- plate, AGM- screw, GEL- and deep-cycle batteries used in vehicles, forklifts, hybrid- vehicles, SUVs, pickups, boats, trucks, motorcycles, travel trailers and even golf carts. Specifications: Material: ABS-, Electronic Component Display: LED Electricity: 12V/10mA, 24V/30mAs Power: 0.5W Working-Voltage: 6-30V Size: Approx. 140x17x53mm/5.51x0.67x2.09in Package Includes: 1 Set Circuit Tester note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.