Last spring I ran across the GSL 2 Surface Laser on Bosch’s German website. It grabbed my attention because it promised to do something that no other laser can do - allow a person working alone to quickly measure the high and low spots on a slab or floor, and without the use of a grade rod or tape. What the tool can do is very cool; how it does it is even more interesting.  

The GSL 2 projects two angled beams onto the floor. The beams converge to form a single line at the benchmark elevation – which the operator sets by means of a knob that raises and lowers the tool. Two lines are visible (the beams diverge) where the floor is high or low so it’s easy to see where the problem spots are. By using the provided target the operator can quickly gauge how high or low a particular spot is – and then come back later to grind or fill that area.  

Measurements must be made at various locations so the tool can be aimed with a hand-held remote. This allows the operator to scan the entire floor without having to walk back and forth to the laser to shift its position. The tool can be rotated a full 360 degrees in either direction at low or high speed – and stopped wherever it’s necessary to gauge elevation.  

According to Bosch, you can see the beams up to 30 feet out on the floor and up to 60 feet out if you use the target. I found that unless the room is very dim it’s hard to see the beams from directly above more than 15 or 20 feet out. But if you look back towards the laser you can pick them up from farther away, and if you use the target (which is necessary to gauge the highs and lows) you can get the full 60 feet of range.  

The tool is said by its maker to be accurate to within +/- 1/8” at 30’ - which is sufficient for flattening surfaces prior to installing wood, tile, and other types of flooring. It comes in an L-Boxx with a remote control, target, and laser glasses, and retails for about $550.  

The GSL2 is not for everyone, but could be a life saver for the contractor or tradesman who needs to quickly and accurately gauge variations in the flatness of flooring substrates. The list would include general contractors, concrete contractors, tile setters, flooring installers, and the like.  

The person who came up with the idea for this laser is extremely clever. Click here or on the photo below for a slideshow (11 slides) that shows how the tool works. Be sure to check out the embedded video at the bottom of this page.