strange electric current tester screwdriver

--------- You are in an electric field which can be detected (touch one finger to the input terminal of an oscilloscope-you will get a response on the scope). It is apparently responding to this potential (not current) difference. - however, think on it- if the thing lights up when applied to such a variety of things- then what use is it? I would like it to indicate if it was applied to a potential difference above some level- i.e. is the contact "hot" or not- rather than giving an indication when applied between parts of the body (not an indication of "life" ). Is there any information on how it is supposed to work? Does it need a battery?

-- Don Kelly snipped-for-privacy@peeshaw.ca remove the urine to answer

He may be talking about something like the Greenlee voltage tester. It does a pretty good job of determining if a wire is hot, through the insulation.

Sorry, Kelly, I didn't answer your query sooner.

There are two tablet battery cells inside, a small solid state electronic rig-up, a neon lamp, and a spring.

It was dirt cheap, in one of those stalls in the market where they sell any three items for a dollar. What attracted me to this gimmick is the way it is displayed in its packaging and its design-construction: like the more expensive Stanley screwdriver electricity presence tester.

No, no literature whatsoever, typical of these Chinese gimmicks, except the labeling inscription: SKYLINK FH-102A 100V-500V.

I am still curious about its exact use.