The Smart Level precision construction altimeter is faster and easier to use than a laser. NO Factory recharge or calibration. There is no math and Smart Level works around corners. In addition to fast accurate height measurements Smart Level also has the ability to map/survey job sites and plot height and distance measurements directly into photos or dig sheets - 3D Image Mapping. If no photo is available, then our AR Mapping is a better option. Accurate to 1/16" or all-sensor model 1/32".