The Matco Tools RTK815 Relay Test Jumper Kit II is a diagnostic service tool designed for passenger vehicles. This unit includes a carrying case for easy portability and storage. It features relay and component testing capabilities, making it a valuable addition to any automotive tool collection. With a warning regarding potential cancer, birth defects, or other reproductive harms, this kit is a must-have for automotive professionals looking to efficiently diagnose and solve electrical issues in vehicles. Includes 4 pass-through testers for 4 pin relays.