All the above are toys. Either get ahold of a serious level or a serious laser. I am both a major Bosch
distributor and the biggest distributor of German Stabila levels and lasers in the country, so know what
I am talking about. I use a real machinist's level. Or, you can use a high-end carpentry level if it has
machined edges. Expect to pay around $75 or so. It's not the kind of thing you'll find at Home Cheapo.
As far as lasers go, I borrowed one in about the $2500 range to do alignments, but then corrected that
factor with front-surface mirror targets, like a collimeter.