Level, parallel and flat are three different things. I see in some of the posts the wrong terms are being used.
As far as calibrating a level or a laser one should know how to do it or at least check it. In a previous life I traveled with bubble levels and optical levels. Knowing how to check them and adjust them was basic to my job as shipping could knock them out of cal. For a bubble level you need a surface that is flat and level enough to float the bubble. Once the bubble is floatingreverse the level and if it indicates that the surface is the same then your good. If the bubble does not indicate the same inclination then it needs adjustment.
For an optical or laser level set it in the middle of the room and level it up. Mark the two opposite walls or posts where the level hits. Once the marks are made, move the level near one of the marks and reset the height so that the close mark is hit indicating that the level is at the same height it was at in the middle of the floor. Now look at the mark on the far wall. If it is right on then you are good. If it is high or low then the machine is off and needs cal.
Then once you get all the precision leveling done, smack it about till it looks right
. If it looks right it is right.
lg
no neat sig line
As far as calibrating a level or a laser one should know how to do it or at least check it. In a previous life I traveled with bubble levels and optical levels. Knowing how to check them and adjust them was basic to my job as shipping could knock them out of cal. For a bubble level you need a surface that is flat and level enough to float the bubble. Once the bubble is floatingreverse the level and if it indicates that the surface is the same then your good. If the bubble does not indicate the same inclination then it needs adjustment.
For an optical or laser level set it in the middle of the room and level it up. Mark the two opposite walls or posts where the level hits. Once the marks are made, move the level near one of the marks and reset the height so that the close mark is hit indicating that the level is at the same height it was at in the middle of the floor. Now look at the mark on the far wall. If it is right on then you are good. If it is high or low then the machine is off and needs cal.
Then once you get all the precision leveling done, smack it about till it looks right
lg
no neat sig line
