Product Description: High Accuracy: Using laser precision technology,accuracy up to ±1/13 inch,measurement distance extends up to 165 feet; With unique 2 Bubble Levels,providing more precise measurement compared to one bubble; Switchable among M/In/Ft for free adjustment. - Multiple Measurement Functions:Distance,length,area,volume,continuous measurement, Pythagorean method-three points; Addition and subtraction; 20 groups data memory; Manually delete data;Low battery indication; Auto shut down after 150s without any operation to save power; Mute setting allows you turn on or off the measure beep at your will. - Durable and Easy To Use: Covered soft rubber is for more shock-resistant and wear-resistant; IP54 waterproof level and dust-proof function protect the laser distance measure to the maximum extent; Large LCD with back light supports better visibility in low-light conditions. - Wide Application: 135Ft/40m Laser Distance Meter has a variety of measurement modes that can be widely used in home improvement,construction,industries and design,especially in large areas such as buildings,rooms,apartments,real estates,factories,warehouses,etc - Package Contents: 1x Laser distance meter 135ft 2× 1.5V AAA batteries 1x Wrist strap 1x User manual