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I replied to myself - but meant to reply to you:

>Haha yeah I have at least ten of those... They do not work on certain glass surfaces, namely any shiny black granite desk.

Do you own one of the 'Darkfield Technology' ones?

That's specifically why I bought this one and it works flawlessly on every glass surface I've tried.

Apparently not, I'll have to try one of those.

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