Hello and Good Afternoon Everyone
I noticed an interesting looking gadget used by an electrician the other day which apparently test various wires and parts for outputted current and voltage. This testing instrument was about the length and size of an ink pen, perhaps a little rounder. I did notice when he touched one end of the instrument to the electrical wire, it reacted like a probe and produced an audible repeated beep sound. When the switch was turned off, the wire being tested failed to produce this audible beep. Unfortunately, I was not close enough to this probing instrument to gather more details about it.
Given this information, I am wondering if someone perhaps knows what this instrument is and provide some link or links to check it out. It looks like it would come in very handy when it comes to troubleshooting electrical wires and components.
Any information or feedback given in reply to this search will be greatly appreciated.