precision testing for 12V automotive relays: This tester delivers accurate and reliable results, helping ensure your vehicle's electrical system functions as intended. Its advanced technology quickly identifies faults, saving time and effort in diagnostics. Dual functionality: In addition to testing automotive relays, it serves as a professional battery checker. This provides a comprehensive car maintenance solution, allowing you to diagnose both relay and battery issues with a single device. User friendly design: Built from durable ABS material, this tester is lightweight yet sturdy. The intuitive interface and compact size make it easy to use for both professionals and enthusiasts, ensuring hassle operation every time. Quick and efficient: The tool delivers results in seconds, enabling mechanics and car owners to quickly identify relay or battery problems without lengthy diagnostic procedures. Use scenarios Routine service: Verify relay operation in engine bay circuits such as starter or fuel pump to ensure reliable performance. Battery maintenance: When replacing or servicing a battery, simultaneously check battery health and relay status to prevent future issues. Field diagnostics: On site checks for vehicles with intermittent electrical problems such as horn or door lock relays to quickly pinpoint faults.