ITEM NAME:12V Universal Electronic Automotive Relay Tester For Cars Auto Battery Chec-OZ Product Description CNBJ-707 is a fast test tool to test automotive relays, so that you know the status of automotive relays. Through the continuous automobile battery (11V-15V) to the relay coil, the detector can properly check the relay contact function. The tester observes contact data, closure time, relay inertia at each test stage, etc. If the test is qualified, the green light will be on, and if the test is not qualified, the red light will be on. Features: This tester is designed to test the.CNBJ-707 is a fast test tool to test automotive relays, so that you know the status of automotive relays. If the test is qualified, the green light will be on, and if the test is not qualified, the red light will be on.