Power ProbeShort/Open Circuit Finder NO Box Car Test Electrical Circuit Tester

Will this work on 5v circuits, I.E. Accelerator pedal, fuel pump signal?

It have a buzzer or some kind o beeping to advertize on short o open circuit ?

Does the difference between the cheaper ect3000 ($134) vs. the more expensive ppect300 ($211) comes down to the carrying box and two extra probes?

Is this a new kit or used as it doesnt have a box