I bought this to replace a cheap bubble level that I was given free of charge once when I bought it. I had to level my washing machine and the cheap one didn't help. Some people think that all cheap planes work fine ("Gravity is universal!") - but that's NOT true. The level must be well done (like this one!). This one works great. The problem with cheap spirit levels (not this one!) is that the plastic case may not be entirely flat. To check your level, check where the bubble is. Then turn the spirit level upside down and check again. Then rotate it 180 degrees (so the side that was on the left is now on the right) and check again. If you don't get the same value every time, you're in a bad level. However, this level passed that test and did exactly what it was supposed to do. It also feels solid, which is an added bonus.
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