Klein Tools Compact Laser Distance Measure (≤ 1mW/ Laser Class 2) provides fast and accurate measurements up to 100 feet (30.5 m) with 1/8-Inch (0.3 cm) accuracy and an accuracy of 1/16-Inch (0.2 cm) for the first 30 feet. This compact design fits in a safety vest or shirt pocket to easily carry around a jobsite. The unit automatically saves the last two measurements on the LCD display screen to quickly compare past measurements.