The Power Probe PP3 Circuit tester kit includes a PP3CSCARB, Pulse Modulation Width Adapter Tip, Penetrator Tip, and flashlight. The Power Probe allows you to test functional compenents in an automotive electrical system. Easily check if the component is working by applying power or ground. If the component works you know its a wiring problem, if it doesn't you need a new component. The Pulse Modulation Tip upgrades your Power Probe to apply pulse modulation width from 5% to 100% to check circuit fans, fuel pumps, and other PWM components. The adapter tip works with the Powe Probe 3, Power Probe 3EZ, Power Probe Basic, Power Probe 4, and Power Probe Maestro. The Penetrator Tip is made out of strong Tungston metal that won't break when penetrating wires. The 800 lumen flashlight illuminates dark workspaces.