The 76 relay circuit tester is not simply a tool to test a relay. It is a tool that can test an entire circuit from the battery to the component in question. Through its function it will also determine if the relay itself is functioning properly. This tool gives the technician the ability to instantly determine the problem within a tested circuit. It will identify at the push of a button if a wire, a part, or a relay is defective, without the use of a multi-meter. If the technician wishes to gain more information about the problem the tool features easily accessible ports for use with other diagnostic tools. This item also has other practical uses. Since the item can jump the relay the technician can use as a remote control starter in engine work like compression testing, distributor or cam shaft adjusting, or run the compressor during an A/C charge. Kit includes the tester, 6 popular relay leads, 1 universal relay lead. Comes in a blow molded case. Works with both 12 and 24 volt systems.