Lisle 60150: Relay Tester, Relay Pro, 12V, 24V, Each - Lisle Relay Pro circuit testers evaluate relays by simply clipping the test leads onto the relay terminal pins using a 12 V or 24 V DC power source. These diagnostic tools allow you to test 4 and 5-pin, shielded or non-shielded relays with different pin sizes, as well as 4-pin normally closed relays that other testers may incorrectly show have failed. Lisle Relay Pro eliminates guesswork because you don't need to connect to specific pins like other testers. Includes 45 in. power leads with heavy-duty gator clips to provide a secure connection to the power source.