We bought two of these for an annual special inspection. Before we use them, we send them to our calibration lab to ensure they meet the manufacturer's specifications. One passed, the other missed the shot. Digi-Pas sends us a new one which passed the first time but when the calibration showed up a year after purchase it failed. There is no way to adjust the calibration on them and the manufacturer does not regulate the calibration. Lesson: Just because it gives an accurate measurement doesn't mean it is accurate. Probably fine for home use, but if you're looking for something precise and accurate, look elsewhere. For home use you don't usually need this level of accuracy, save money by buying a cheap digital level from Home Depot.
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