Universal Electronic Automotive Relay Tester For Car Auto Battery Checker 12V UK
3RD Brake light for Trailer Caravan Brake Stop 12v 310MM 24-2 LED red 24-2 LED. 1 x Relay Tester. The coil resistance is preferably above or equal 20 ohms. If the relay is abnormal the red LED will light, it's normal the green LED will light.