[Multi-functional Circuit Diagnosis]: Integrates short-circuit testing, open-circuit detection, wire tracking, and other multi-functions in one, effectively identifies circuit problems, accelerate the automotive troubleshooting and repairing process, and enhances maintenance efficiency. With illumination function, applicable to a variety of complex maintenance environments. [LCD Backlit Display]: The backlit LCD display guarantees easy reading even in low light conditions, while real-time voltage measurements are accompanied by audible beeps, ensuring an intuitive and immediate understanding of test results. [Humanized Design]: The soft rubber handle offers a comfortable, anti-slip grip designed for prolonged use and durability. It comes equipped with a versatile 3.6-meter flexible, retractable cable, significantly expanding the scope of testing. An anti-loss probe protecting sleeve and a robust, large-sized alligator clip are integrated to enhance operational while enhancing the tool's overall functionality and practicality. [Bi-polarity Test Function]: The bi-polarity test function utilizes distinct red and green LEDs, providing an instant and intuitive differentiation between positive and negative poles, which ensures quick and error-free polarity testing. [Wide Applications]: The digital display automotive tester boasts a versatile operating voltage ranges from 4VDC to 75VDC, making it universally compatible with all vehicle electrical systems within 6/12/24/48V. It is an indispensable professional tool for automobile repairs and maintenance. Material: Plastic colour: Red+Black Package Contents: 1 x Auto Power Test Pen Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.