I've seen concepts of this on various tech blogs before, but never something real...and cheap! You want to know when the water gets hot, to wash your hands...why make your digits suffer hypothermia while you wait? Instead, let this LED faucet head give you a visual clue: cold water, blue; water above 89 degrees? Red. Simple, and even useful for those middle of the night sink runs! Plus the cool/geek factor cannot be beat.
Oh, the price for this cutting edge gadget? Hang on to that Jackson: $19.99. Now we're talking!