About this item HIGH PRECISION - Using laser precision technology, accuracy up to 0.3-50M with 1.5mm measurement accuracy , the measurement distance extends up to 50 m; Switchable between M / In / Ft for free adjustment. With 2 unique bubble levels that allow for more accurate measurement compared to a bubble. LCD BACKLIGHT & SQUELCH ADJUSTMENT - The large backlit display gives you better visibility in dark areas. With the mute function, you can activate or deactivate the acoustic signal as you wish. Suitable for use in libraries, classrooms and other quiet places. MULTIPLE MEASUREMENT FUNCTIONS - area, distance, length, volume, continuous measurement, Pythagorean method - three points; Addition and subtraction; Low battery indicator; 99 groups of data storage; Delete data manually; Auto shut-off after 150 seconds without operation to save electricity. DURABLE AND CONVENIENT - IP54 waterproof and dustproof function provide 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.