Checking a level's accuracy
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Level accuracy test
Put sheets of paper under the level until
you get a level reading, then switch
ends to see if you
get the same reading.
If you drop your level or doubt its accuracy, the best way to check it is to place the level on a relatively level surface.
Shim up the low end until you get a level reading. Make sure to
stand perpendicular to the vial when looking at it. Once you get a level
reading, turn the level around 180 degrees. If the vial still shows level, you're
getting accurate readings.
Check the vial that gives you a plumb reading by placing
the level against a door frame. Tape paper shims
to the jamb until it's plumb, then flip the level
upside down and check for plumb again.
Some levels have vials that can be adjusted.
But our advice is to buy a new level if yours is
out of whack.