1.Outstanding Durability: Built with workmanship and quality raw materials, our Relay Tester provides reliable performance. Its sturdy construction and absence of any odor makes it safe to use for testing automotive relays. 2.Enhanced Reliability: Instantly assess relay performance with our tester, as red LED lights up for failure and green signals normal function; easily track data, closing time, and relay inertia for precise results. 3.Extensive Use: Seamlessly test most common automotive relays from 11V to 15V, ensuring your vehicle's 12V sensor and battery voltage are in conditions. 4.Ease of Carrying: Take your testing on the road and never miss a beat. This relay tester is small, lightweight, and for outdoors diagnostics. Pack it in the easytocarry bag and effortlessly test your electrical systems at home or on your travels.