Johnson Level 40-6005 230-Feet Laser Distance Measure Acurate to 230-Inch with a plus or minus 1/16 -Inch With units of measure as follows inches (decimal 1/8, 1/16, 1/32) Feet, Feet and Inchs Metric Measuring types single distance, Min/max, continuous measuring countdown timer and stackout function Caculated and indirect measuring Addition / subtraction area Volume, 3 Pythagoras functions 2 point pythagoras 3 point pythagoras 3 point partial pythagoras High speed micro processor that caculates quickly Laser Class Il, Power output 1mW