This is the only floor laser tool that helps make floors flat and level. The difference between using this tool versus a straight edge is that the floor can be made not only flat but also level. It doesn't take a lot of time or skill to use this tool whereas it does if you use straight edges.
It came in a rugged toolbox I have seen them sold for around $65. The tool itself weighs around 2-3 pounds. In the box were the remote control, target plate, and batteries and insert for the tool.
This tool works by using two lasers that together show elevations and depressions in a floor. As flooring contractors know it would be necessary to get down with kneepads and use a straight edge to check for elevations and depressions. It is a requisite to get the concrete subflooring as flat as possible because If the subfloor isn't flat, the tile can pop or the adhesive can loosen over time. Flooring professionals know about all this and use additional bonding materials and grinding machines to fix such problems.
Great tool Highly I Recommend For All Flooring Contractors!