Build your own with a kit from Thinkgeek.
I always figured the most useless machine was a touchless soap dispenser.
Only because they marketed it wrong.
If it had been targeted at people who don’t want to make the soap dispenser filthy when they come in to wash their dirty hands, that would make sense.
Instead, it was “OMG! There are GERMS on your SOAP DISPENSER!!!1one - you’ll get fucking GERMS on your hands (right before you wash them)”
I remember an L.E.D tester device you could buy from electronic hobby shops.
It was a box with a plug socket arrangement, you plugged in your l.e.d that you wanted to test, closed the box and pressed a button, a current went through the l.e.d in the box, and the light output was picked up by a LDR, this in turn drove a small transistor, which then lit up an l.e.d on the outside of the box, thus proving that the mystery l.e.d. was working.
[quote=“Mangetout, post:4, topic:693098”]
I’m still awfully fond of this one:
[/QUOTE]I have one of those that doubles as a belt sander.