This is a simple parametric printable laser level.

order 8mm bubbles, simple line laser, and Lithium polymer (LiPo) battery for hobby store for miniature helicopters, and the tiniest switch radio shack sells.
Adjust parameters for the laser size, and assemble with button head screws. InsertPairMK10 should be modified if you cannot find the "tiny switch" at your local Radioshack. It is not always carried in every store.