ACCURATE MEASUREMENT: Reliable measurement range from 0.04 to 50m or 165ft. Measurement accuracy: 2mm. Change four units with one button: m or ft or in or ft and in Thanks to the advanced 2-bubble leveling, for precise vertical and horizontal alignment of the laser. use 2 reference points to select the front or back edge of the device as the starting point of the measurement, the measurement data is more accurate. MULTIFUNCTION: Measure distance, area, volume accurately , Pythagorean function (indirect measurement) Continuous measurement function and Auto sum function. Maximum and minimum values at the touch of a button. Ideal for home, construction and industry, especially in large areas such as apartments, buildings, real estate, factories, warehouses, construction and industries. LARGE BACKLIGHT LCD and MUTE SWITCH: Super large backlight display provides users with better visibility. mute function suppress the beep sound in quiet environments (libraries, class) 20 sets of data memory recall function for verification and calculation Automatic shutdown after no operation at 180s to save power. PORTABLE NON-SLIP: IP54 dustproof and waterproof ensure maximum protection in harsh working conditions. Non-slip design: Wrapped with soft rubber good grip, wrist strap provided to prevent slipping. It can be easily put in a gift bag