Using laser precision technology, accuracy up to ±0.3-50M with measuring accuracy of ±1.5mm, measuring distance extends up to 50m;Switchable between M/In/Ft for free adjustment.With 2 unique bubble levels that allow for more precise measurement compared to a bubble. The large backlit screen gives you better visibility in dark areas. With the mute function, you can turn the sound signal on or off as you wish.Suitable for use in libraries, classrooms and other quiet places. area, distance, length, volume, continuous measurement, Pythagorean method - three points;Addition and subtraction;Low battery indicator;99 data storage groups;Delete data manually;Automatic shutdown after 150 seconds without operation to save electricity. IP54 waterproof and dustproof function provides maximum protection for the laser distance measuring device.Portable size and hard rubber body ensure good grip;With the wrist strap, you can hold the measuring device firmly and carry it easily.