Compact Line & Dot Lasers
There are a lot of inexpensive small line and dot lasers on the market some being no more than toys. RedBack Lasers Self Levelling, compact Indoor Lasers are built for the trade and can be re-calibrated if required, unlike some.
Two models the DL3 with horizontal and vertical lines plus ceiling cross and plumb dot down. The DLD5x has horizontal and vertical lines but also 5 laser dots or points for plumb level and square. Both come with magnetic base that also allows mounting on tripods.
These laser levels come with an automatic two year warranty from RedBack lasers.
Also check out the Dot, 2 Way, 3 Way and 5 Way multi point lasers HERE
And the 3D 360 Multi Line Lasers HERE