1.Measuring range: 0.05 - 50.00 meters; Accuracy: +/- 1.5 mm (accurate to 3 decimal places); 99 data memories, switchable units (meters, inches and feet); Optical lens: with two photosensitive holes, more accurate and stable measurement data; Calibration and error reporting function 2. Various functions: accurate measurement of distance, area, volume, Pythagoras function (indirect measurement), continuous measurement function, plus and minus measurement, minimum and maximum values; automatic shutdown 3. Silent function: Silent function to avoid noise; 4 lines of large LCD display with backlight; rugged shockproof housing, protection class IP54 (splash-proof, dust-proof), long service life, but also suitable for wet or dirty environments 4. Easy to use: just touch the button, you can quickly check the height and length of the building, or area and volume, suitable for DIY enthusiasts and professionals CE / FDA / FCC / RoHS certified. 5.Apply to construction sites, especially apartments, buildings, factories and warehouses.