AERMOTOR Automotive Circuit Relay Tester Repair Tool(AERBJ-707)1. Can quickly detect whether your relay is normal, easy to use, suitable for automotive relays on the market, support 12V and 24V relay testing 2. Most car lights, wipers, starters, air conditioners, electric seats, electric doors and windows, anti lock brakes and audio use relays. Automotive relays are subject to vibration, high temperature, low temperature, humidity, etc., which will reduce their lifespan. However, once a relay fails, it will