Voltcraft-RT-100-Tester-VOLTCRAFT-RT-100-P-The-Voltcraft-RT-100-automobile-relay-tester-is-intended-for-making-fast-&-easy-checks-of-most-current-automobile-relays-with-4-or-5-connections-The-tester-performs-a-full-automatic-check-of-the-relay-&-indicates-the-result-with-a-light-green-OK-red-error-BR-The-test-is-performed-at-the-coil-&-contact-side-Only-one-relay-can-be-tested-at-a-time-P-P-The-automobile-relay-tester-requires-an-automobile-direct-current-of-12V-to-opera