Are line levels accurate?
To test if a level is accurate, you need to test it against itself, for each vial for horizontal and vertical planes, and at 45 degrees.
When you test, check the bubble and see if it is still between the lines.
It may be slightly off, so your level will not be accurate.
How do you run a string level?
Tie each end of a nylon string to the wooden stakes, leaving it loose enough to adjust later. Place a line level on the middle of the string. Tie the string tightly around one stake. Go to the other stake and adjust the string up or down until the bubble on the vial rests between the black lines.
How do you make a level line around a room?
Drawing a Level Line on Your House Exterior –
How do you use a pitch level?
Cheap Method To Measure Grade –