Product Description Easy operation- Just connect. It provides quick readings to determine if the vehicle battery needs to be jumpered or replaced and the status of the alternator output. Various colored LEDs indicate battery or alternator status. Safety Guarantee- Reverse connection and overvoltage protection make it safe and easy to use. Digital Voltmeter Test Range: 4-20V DC. [If the voltage is lower than 4 volts, the screen will display - "LO"; if it exceeds 20 volts, the screen will display - "HI"] High Accuracy- With four-digit luminous digital display, the voltage test accuracy will be close to 0.01 volts. [Note: Verified fakes are displayed with only 3 characters. The accuracy is only 1/10 of ours. Rubber paint body reaches original quality- The black rubber paint on the body surface achieves the best feel. As inventors and manufacturers of testers, we pay attention to details to ensure brand quality and a good customer buying experience. Daily Use- Economical and practical tool for daily inspection of battery and charging system. Package includes: 1*Digital battery tester