The Ultra Dimension Master 50 Laser Distance Measurer (3344) from Calculated Industries is capable of fast, accurate indoor measurements from 20 inches to 50 feet with 99.0% accuracy. It's easy to use: just aim and press a button, when the unit beeps, you've got a measurement. It works by using a narrow ultrasonic beam to measure at the speed of sound, even in areas with furniture or fixtures. Great for real estate agents, interior decorators, appraisers, estimators, remodelers and designers to quickly and accurately measure square footage.