Cal-Van Tools Relay Circuit Tester features the 1975 relay circuit tester. It 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. This 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. The item can jump the relay so the technician can use it as a remote control starter in engine work. The technician can also use it like compression testing, distributor or cam shaft adjusting, or run the compressor during an A/C charge. The kit includes the tester, 5 popular relay leads and 1 universal relay lead. It comes in a blow molded case with a high density foam insert. It has a patent pending.