Any idea how to use a laser level to make sure ground is level for installing an above ground pool? Pool is 16x 26.

Never tried this but here goes anyway. Float it on piece of wood in a tub. No matter where you point it the laser line will be the same height.

You will need to use a laser level that can be mounted on a tripod. You make sure the laser in aimed on a level plane (some are self leveling others you have to do manually) then you attatch a laser detector to a measuring rod and set the detector to the same height as the laser right next to the tripod. then you can walk around the area where to pool will be going and add/remove dirt until the detector is at the same level as the laser. you will find laser levels at most rental centers and they can help explain the process to you as it is a little easier to understand when you have the parts in front of you