Stok Laser Distance Measuring Meter Portable Device (0. 16 To 164ft) Portable Laser Distance Meter, Measure any distance from 0. 05 to 50 meters, easily, quickly and with high accuracy. Mini Laser Distance with multi-functions, measuring unit switch, the measurement of distance, area, Pythagoras measurement, Addition or subtraction. Self-calibration function, with adjusting range of -9 to 9mm, keep the precision of the device; Record function, save the 100 measuring data and keep your safe right in the meter. Power supply is two AAA batteries (Included) Packed with wrist wrap and carry case, this lightweight gadget can be taken anywhere from a construction site to a hiking trip.