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Shopping for Transits & Builders Levels t happens to me about once a month. Somebody brings in a transit they bought for $200 or $300 and wants me to adjust it. I calibrate the instrument (see photo above), make sure everything is tight, and double check my work the next day. But a week or two later, the owner calls and says, "It's out of calibration again! Why?" Why, indeed. Like tools of any kind, optical levels and transits aren't all created equal. There are some cheaply built instruments on the market, and even some of the best companies make models on the lower end of the spectrum that should be avoided. First, some definitions. When I say level, I'm talking