DMiotech a15062600ux0221 Laser Distance Measure Mini Handheld Digital Laser Distance Meter Rangefinder Measurer Tape Diastimeter with LCD Backlight Red, 131ft 40m Easy addition/subtraction of measurement. Set up front/rear benchmark. Switchable among meter (m), inch (in), feet (ft.) High accuracy and wide measuring range up to 40m. Min/Max distance tracking (display value) Quick measurement of distance, area and volume with one button operation. Indirect measurement by Pythagorean theorem Automatic calculation of area and volume. Auto correction and error report technology. Large LCD with backlight Widely used in construction and industries, especially in large areas such as rooms, apartments, buildings, real estates, factories, warehouses, etc.