Seems kind of interesting, from my perspective. Clearly, when he was "touching" the nail, versus "touching" the coin, with the pinpointer, there were two clearly different tones. Nice!
What I wish he would have done is show if there is ALSO that tonal difference when the objects were, say, an inch or so away from the unit. In other words, how far from the tip of the pinpointer is the "discrimination" accurate? Is it the same tone for both objects, until you are essentially "touching" the object? If that's that case, that is of very little use from my perspective. BUT -- if you have that different tone all the way out (or close to it) to the maximum detecting distance, now that's a whole other thing, and would be quite useful, IMO.
Guess we'll have to see some more. I really wish he'd have held the nail, and the coin, an inch or so from the pinpointer and held them stationary, so we could see if the different tone, the "discrimination." was functional at that greater distance from the unit.
Steve
