The bosch gsl 2 professional line laser is the world39s first floor surface laser it offers the user more safety due to a complete check of the entire surface all completed in even less time it quickly displays surface irregularities precisely and simply using one principle if one line is displayed the surface is flat if the line is broken the surface is not flat it is an ideal tool for site managers surveyors and those in the flooring trade comes complete with l boxx laser target