The TP-300-A is an affordable alternative to EL-35616-300A. "Test, Don't guess!" Great for checking terminal tension. These Terminal Probes are the tools of choice for wiring and electronic component diagnosis. Well engineered to support proper diagnosis and will not damage terminals or harnesses. *Includes sturdy plastic box* Terminal Test Probes Kit designed to properly test electrical and computer circuits used in GM vehicles, without damage to the terminal ends of the connector being tested Application The TP-300-A Probe Kit includes the most popular probes and components that are required to service majority of current GM vehicles glo Function .