1. MULTIPURPOSE: With its multifunctional integration design, our automotive circuit tester enables efficient load testing, short circuit or fuse fault diagnosis, voltage testing, and pulse signal testing. It also features a current polarity indicator for comprehensive diagnosis of all electrical issues. 2. IMPROVED CIRCUIT DIAGNOSIS: Equipped with a 12V 5W test lamp and LED indicator, it supports fast test mode or lamp mode. Easily diagnose battery failures or fuse problems and assess voltage based on lamp brightness. 3. EFFICIENT FAULT DIAGNOSIS: Our automotive circuit tester includes a test lamp, allowing quick detection of cable power failures and identification of hidden bad contacts. With dual functionality as a load, it performs lamp load and voltage tests for more accurate results. 4. ADVANCED POLARITY DETECTION: Featuring two probes, this automotive circuit tester simplifies load equipment testing and displays current polarity—red light for positive, green for negative.