These amazing devices send out narrow beams of sound waves that bounce off solid objects and send the information into the hand-held set. Custom electronics and microprocessor convert the elapsed time into a distance measurement and display it on the easy-to-read display. The Sonin 60 measures up to 60 feet with a “smart” beam cone that funnels sound waves to get accurate measurements through doorway arches along with seven storage memories. The Laser Targeting Range Finder is the Sonin 60 but adds a laser pointer to accurately display where you are measuring to. The Combo Pro will measure up to a whopping 250 feet using a target. It is perfect for outdoors with seven storage memories.