QUOTE (geckostudios @ Jan 21 2007, 01:02 AM)

That's a neat find. It would be good for relative measurements (comparing changes you've made to your own system) but they wouldn't translate well to measurements from others on different instruments. Would be an inexpensive tuning tool.
David
very true tomato/tomahto but would probably be better than the naked eye at judging whether moving the reflector, etc. made any noticable difference.