AA batteries

Compact Cordless Relay Tester. If precision and efficiency are non-negotiable on your garage checklist, our Compact Cordless Relay Tester is your perfect solution. Why Choose Our Compact Cordless Relay Tester?.

Battery-Powered Automotive Relay Tester. Why choose our Relay Tester?. - Conveniently tests 12V 4 & 5 Pin Relays. - LED Indicator for clear results. Instant results with a clear LED indicator: green for pass and red for fail.