Use to test electronic fuel injection signals, idle air control circuit and spark plug circuits Includes: 8 Noid Lights for checking GM PFI, FORD TBI, GEO TBI, BOSCH PFI, GM TBI, GM SCPI, BOSCH 2 and GM MULTEC 2 2 IAC Test Lights for straight and 90° applications In-Line Ignition Spark Checker Quickly diagnose “no start” and engine miss conditions in the electrical fuel injection and spark plug circuits Analyze rough running engines Supplied with instructions in a durable, plastic molded storage case