STONEX D1 digital autolevel is the recommended leveling instrument for contractors, builders, professionals land surveyors and Engineers who demand accurate leveling every time. The accuracy of ± 1.5 mm on a base of 1 Km – double run – makes STONEX D1 the perfect equipment for the 3rd order leveling and for construction industry. Faster automatic measurements – difference in height and distance – are digitally determined: the fully electronic measurement results appear in the clearly visible display window after less than 2 seconds.