You walk into a tool store and pick up a level. Is it? Is it really Level? How do you know it is accurate?
Here's a hint. 70% of all levels on the shelf at our local stores are not accurate.
Check a nearby shelf for level. Then rotate the level... check again. Flip it and check again. The bubble should be precisely in the same place. If not... it is not accurate. DON'T BUY IT!
Check for vertical level-- Plumb. Same procedure. Rotate the level, flip.
Try to imagine building something perfect when each time you check something with your level you get a different reading.
Don't assume that just because a level is expensive, that it is accurate. I've gone into a store with the intention of buying a good level--and after checking them I left with an $8.00 level because it was the only accurate one on the shelf.
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