By simply aiming it at a target object (e.g., wall, ceiling, building, pole) and pushing a button to active the laser beam, a Hand-Held Laser Distance Meter will measure, record, and display on its LCD screen the distance in whatever unit of measurement the user desires. Models differ as to range (from 50 feet up to 330 feet), memory capacity, option, etc.; and some are Bluetooth-enabled, which allows one to save results to a smart phone.