. I bought Loctite mounting putty and use it to tape the target board to the outside of the wall of the building I need to measure. The laser light is reflected back to you, making it easy to see from hundreds of meters away, even in sunlight. I bought a pair of $25 binoculars to see a laser's reflection off a target a few hundred feet away. I recently posted a floor with it and it's a lot better than asking a colleague for help because they're just trying to take responsibility and not just help with what you need help with. Now I don't have to ask anymore! LOVE ITTTTT