LED Digital Display: Dual 2-in-1 display shows battery capacity and voltage. The bar graph (8 colors) indicates battery power (2 red, 6 green). The lower voltmeter displays battery voltage with a decimal point. The voltmeter position automatically adjusts for greater precision. Applicable Batteries: This car battery tester is suitable for 12-72V lithium batteries (12V, 24V, 36V, 48V, 60V), lead-acid batteries, polymer batteries, nickel-metal hydride batteries, etc. Wide Range of Use: This battery capacity voltage indicator can be used in golf carts, cars, RVs, electric vehicles, self-balancing vehicles, robots, and portable equipment. Connection Method: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery being tested. The digital tube will display the battery's power and voltage in real-time. (Ensure correct connection; reversing will cause damage). Note: All data is measured manually. Please allow for a 1 to 3 cm error. Due to differences in lighting and display, there may be slight color variations. The actual received item will prevail.