jetajockey
come get me tang police!
I once made a drop checker out of a plastic container from a gumball/toy machine, the plastic narrow end of a ball point pen, and a suction cup. It was ugly, but it worked. I've since gone with a red sea drop checker, which isn't much prettier. If it was in a display tank I'd probably fork out for one of those pretty glass ones. I found a writeup on how to DIY it on some forum