Product Features: 1. Distance/ Area/Volume measurement. 2. Single/Continuous measurement. 3. Addition/ Subtraction Measurement. 4. Units and benchmark selectable. 5. Double bubble levels. ★ HIGH ACCURACY & UNIT SWITCHABLE-With unique 2 Bubble Levels, providing more precise measurement compared to one bubble; Switchable among M/In/Ft for free adjustment. ★ LCD BACKLIGHT & MUTE SETTING-Large backlight screen provides you with a better visibility in dark areas; Mute setting allows you turn on or off the measure beep at your will, suitable for using in library, classroom and other quiet places,the laser level is ideal for home, construction and industries, especially in large areas such as rooms, apartments, buildings, real estates, factories, warehouses, etc. ★ MULTIPLE MEASUREMENT FEATURES-Area, distance, length, volume, continuous measurement, Pythagorean method-three points; Addition and subtraction; Low battery indication; 20 groups data memory.