The Ancel PB500 Power Probe is a versatile diagnostic tool that can perform a variety of functions that are useful for automotive electrical testing and troubleshooting. Even as a beginner at electrical testing at the time, I found it very helpful.
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I was able to test out my headlights, and wiring for headlights through putting voltage directly to the fuse. I also tested components out of the car with built-in ground cable + some other tests in my short test.
I found the component activation most useful, as you can have a bi-directional function for vehicles that do not support OBD2 yet.