Interesting anecdote about a "touch switch" digital chess clock

It's my contention that the Chronos "touch switch" chess clocks are the best on the market.  With these clocks, you simply touch the metal disc on your side and it registers - very quick and smooth without having to fully press anything.  The display is very clear as well.

Interestingly, I observed a game at my club where a player in time pressure with a winning position was hitting a touch-switch clock with a captured piece (as some players do) rather than his fingers - and it didn't register.  With these clocks, it must be skin that makes contact.  He wasn't aware of this and lost on time with about 8 of us watching. Even though I was the TD and observing this, I couldn't say anything (nor would I).  It is the player's responsibilty to be sure the clock is responding.