This is the first solution laser GLL 2-50 specifically for checking the flatness of floors –quickly and reliably.It gives more safety due to a complete check of the entire surface, and it does so in even less time.It displays surface irregularities precisely using a simple principle: one line means flat, broken line means not flat. Having a remote control makes it easier and more comfortable to operate. It has a working range with receiver up to 20m and accuracy 0,3mm/m.