A revolutionary measuring gadget! Here's a device that can calculate length at the touch of a button. This intelligent Electronic Distance Measuring Tool sends out narrow beams of ultrasonic waves that can "bounce" off solid objects back to the hand-held receiver. Custom electronics and a microprocessor then convert elapsed time into a distance measurement and display it on the LCD. You can get results in meters or in feet. It's fool proof and simple to use: just point at a target, press the "read" button , instant measurement.