- Durable Construction: The circuit test probe features a robust AS plastic handle that is both sturdy and heat-resistant. The metal probe ensures long-lasting use with excellent wear resistance and precision craftsmanship. - Bidirectional Voltage Testing: Easily connect the alligator clip to either negative or positive ground. The integrated LED on the circuit board provides clear polarity indication—red light for positive polarity ("+") and green light for negative polarity ("-"). - Versatile Voltage Range: This circuit tester operates effectively within a voltage range of 3V to 90V DC, making it ideal for a variety of vehicle circuit tests. Its compact length of 19cm (7.5in) and extendable spring wire (60cm-1.8m or 23.6in-5.9ft) offer flexibility in use. - Portability: Designed with a coiled spring wire, this long probe pen is lighter and more compact than traditional styluses, ensuring it occupies minimal space in your toolbox or storage area. Practical Applications: - Perfect for automotive diagnostics, enabling quick testing of vehicle electrical systems. - Ideal for DIY electronics projects, allowing easy troubleshooting and verification of circuit functionality. - Useful in professional settings, such as repair shops, where reliable circuit testing is essential for efficient service. This circuit tester combines essential features with durable construction, making it an indispensable tool for both professionals and hobbyists alike.