Floor Levelling is a method used to measure levels or points on an area or surface. For example, it’s used to determine height differences between two points, usually with the help of a laser level or spirit level. A laser level displays varying heights by reflecting a beam off a laser receiver.
There is also the option of using a spirit leveler (the longer, the better) and laying it on the floor. Look to see whether the bubble is central. You can measure your slope by lifting the spirit level until the bubble is central and then measuring the gap between the level and the floor.
The process is then followed up by the use of a concrete grinder to reduce the size of bumps (high spots) in concrete slabs and using a Floor Leveling compound to fill in the low areas. This is done primarily to prepare the slab for laying floor coverings with minimal tolerances.