As a building contractor/remodeling carpenter, my advice to anyone is,,BUY THIS THING NOW !!! I often work alone and the audible beep feature is fantastic. As I approach dead level, the beeps get faster till it changes over to a solid tone. Accuracy is exellent. I did sand off 1 paint knob but for a tool that I use so often, those 2 minutes of "set-up" were well worth the time. Most of the finish is still on the tool. Fair for 8 years of use. It measures in 3 modes % grade, inches of rise per foot and 90 degree scales level or plumb. Automatic compensation for reading upside down, for overhead work. Display is aways right side up. Calibration is simple and quick, usually when I check it though, it's still dead-on. GREAT TOOL , BUY ONE NOW!!!