Stanley STHT77140 Laser Distance Measurer TLM330 Calculated distance, area and volume with a range up to 330-feet (100m) and accuracy of +/- 1/32-Inch (1mm) Stanley - Black & Decker Indirect measurement using Pythagoras Inclination sensor digital leveling function Backlit, 3-line display This is a Class 2 laser product, Power output  1mW. Calculated distance, area and volume with a range up to 330-feet (100m) and accuracy of +/- 1/32-Inch (1mm) Continuous measurement tracking function with addition and subtraction Indirect measurement using Pythagoras Inclination sensor digital leveling function Backlit, 3-line display