Bosch Surface Laser for Floor Leveling and Preparation GSL 2

Headline is: It works better than you would think. And I'm not enthusiastic about anything that works, I just wrote a review about the Bosch D-Tect150 D-Tect Wallscanner where I discribe the worst product I ever bought. But GSL 2 is just so usefull!! I build houses in Brazil, to do a level concrete floor you need to set the screed lines, and to check if they are 100% level might take time and probably won't be as precise without the GSL. The battery lasts more then you would think, I've used it twice a week for 4 months now and the battery lights are still full. The remote control is just great as well, the 3 different speeds work for 180° turns with no long wait and for precise positioning as well. It comes on a lovely case, looks very durable, but maybe a little too big if you want to travel around with it, I would say it's good if you want to put more staff in it. The only down side is how bright the light is. Not bright enoght to see outdoor, but not less then what you could expect, on the floor is a little hard to see but when the light hits the board it gets way brighter! Buy the product

Works great, just don't really use it enough

Maybe works ok on concrete, but not on plywood flooring. As others said the accuracy is pretty bad, and almost impossible to get a good and reliable joint beam - it's always too thick and very difficult to set.Inside the house, with shutters closed and just a patio door opening shining light (not full sun) at 12-15 feet the laser beam it's already difficult to see.In sum, not worth the money for me - inaccurate, unreliable, and in truth not performing as advertised, which it's a shame as there is nothing equal in the market.NOT recommendedps: the remote control it's really great, and plus accept bosch 12 volt battery

Unit is not visible in sunlight, had to return the unit.

I got one. FYI the way it works is it shoots two laser beams that are and "X" that' are each self leveled but at 90 deg to each other.The point of a tool like this is when a GC shoots a laser line it is a line from the point of the laser tripod. But the issue with flooring is while you might be level over 10' you might have lumps and bumps in the concrete over that space. This tool is intended to find those lumps and bumps like normal floor layer would use a 10' concrete aluminum screed.It works but there is are some major issues.First and foremost, most flooring requires concrete to meet the 1/8" in 10' requirement. The measurement plate that comes with the laser starts at 1/8" and then goes up to a few inches. Sorry but if the floor has a 3" out of alignment you have huge issues, the point of a tool like this is determining 1/16" vs 1/8". And this laser gets close but is hard to do. I am sure it is in the design of the plate or perhaps the angle of the X that the laser beams shoot out. You see, the laser is greatly influenced by the way you set the plate on the floor. You have to have the plate perfectly on the floor to get a good reading. Also, on the plate, the difference between 1/8" and 1/4" is VERY close and really makes it hard to easily say where the beam sits. The laser beam is as wide as the space between 1/8" and 1/4". It would have been better if the laser made greater differentiation in the 0-1/2" range (aka have 0" as center and each 1/8" hash mark 1" apart from each other. Rather, you get a plate to show you a range of 0" to 3+" over about 3". My boss ended up walking around the job with a piece of cardboard to see how far apart the lines were as moving the little plastic target around was time consuming.Better thing to do is use your normal straight edge on these locations where the beams separate and then mark the floor.Second, when you first set up this laser you align the two lasers to meet into one beam in front. But it is hard to' see when they are aligned since they are such wide laser lines. And if they are off you can throw your measurements off by over 1/8" easy.Third, It is limited by dirt. Most job sites are not kept clean. So, when you show up to do a site inspection while you can drag around a 10' screed over the dirt, this tool requires you to broom clean the floor, otherwise every 1/8"' size bit of junk shows the floor as out of alignment.A test case:I used it on a job where the entire floor had supposedly been 'self leveled' with Ardex K15. The GSL 2 found the lumps and bumps that the SLU applicators left on a floor. I'm looking forward to a job where I get to call back the applicator and tell him to fix' / diamond grind the floor. I think this tool is going to make for a lot of unhappy GC's when flooring guys find all the flaws in concrete. But, I hope it will mean fewer arguments as it is self explanatory. You can't really argue with it. Now how to get paid for checking other trade's poor quality work...

This one works perfectly.Good buy....great price.

Really, really easy to use and very accurate. My only gripe is that in moderately bright room the lasers are tough to see and the glasses that are provided with the tool are not made for an adult. The ear pieces on the glasses are really short (the fit my 10 year old son perfectly, but I couldn't use them).

Battery indication ok but no laser beams from unit.