Laser measurement for speaker position

It is not unusual to spend a few hours placing my speakers. And of course the point is that once your speakers are properly placed you can move your head, if necessary, to find the sweet spot. 

Fascinating story about the party.  So to be clear, you're having a social gathering at your house and the topic just naturally turns to your listening acuity and the precision of your loudspeaker/listening chair setup?  Okay.  And at this gathering some wild and crazy guy decides to play a joke by moving your chair and seeing if you notice?  (I can only imagine that copious amounts of alcohol were invovled).  Though the chair move was not visible to the human eye, you still were able to immediately hear the deleterious sonic effects.  Was the lady as impressed as we are?

Great find. I use a laser measure for the same purpose and I agree it's really useful, but it was more expensive than this one.

To those who are objecting that a fraction of an inch doesn't matter, that's probably true, but getting things reasonably close does and it's a lot easier to do that with a laser measure than with a tape.