The OEMTOOLS 8-pc Noid Light Set, No. 37161, is designed to check electrical impulses from the wiring harness to the fuel injectors. It features a see-through design to check electrical pulses including GM TBI, GM SCPI, GM PFI, Ford TBI, GEO TBI, Bosch PFI, Bosch Type 2, and GM Multec 2. The set comes in a sturdy blow molded case.