Feature: 1. LED Reverse Display Screen: Car battery tester has an LED reverse display screen, and the backlight is also clearly tested to display the reverse display screen. You can also see the measured value clearly at night or in the dark to assist the measurement work, and it is easy to read. 2. Multiple Protection: Positive and negative crocodile clips have reverse connection alarm and overvoltage protection, the red clip connects to the positive and black clip connects to the negative, if the connection is reversed the LED display does not show, reverse indicator lights up and issues an alarm alert. 3. Indication Status: When the car battery is properly connected, the LED display will show the real time voltage of the measured voltage, and the LED lights up to indicate the battery status. 4. Easy Operation: Ready to use once connected. Automotive alternator tester provides a quick reading to determine if the vehicle's battery needs to be jumped or replaced, as well as the output status of the alternator. Various colored LED lights show the status of the battery or alternator. 5. Widely Used: Digital auto battery analyzer is widely used in the auto repair industry, especially for automotive, electric vehicle maintenance technicians and family, business vehicle maintenance and repair, etc. Specification: Item Type: Automotive Alternator Tester Material: ABS Test Method: Positive and negative test clips Test Voltage: 12V LED Lights: Red, yellow, green, blue and white color lights Use: Especially suitable for car, electric car maintenance technicians and family, business vehicle maintenance and repair, etc.. Package List: 1 x Automotive Alternator Tester1 x Instruction Manual