About this item HIGH PRECISION: thanks to laser precision technology, accuracy up to 0.3-50 m with a measurement accuracy of 1.5 mm , the measuring distance extends up to 50 m; Switchable between M/In/Ft for free adjustment. With 2 unique bubble levels that allow more precise measurement compared to a bubble. LCD BACKLIGHT AND SQUELCH ADJUSTMENT - The large backlit display gives you better visibility in dark areas. With the mute function, you can activate or deactivate the sound 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 provides maximum protection for the measuring device. laser range. Portable size and hard rubber body ensure good grip; With the wrist strap, you can hold the measuring device firmly and carry it easily.