I used to use the PC5 hand held units. some were used for operating ultrasonic x-ray machines i used to build. You can walk inside the "envelope" of the machine and hand control it to line it up at certain points. Never took one apart but did fill a dumpster with them before I knew about scrapping and the company was doing a clean out. Prob not much of a market to sell it as they are usually custom for each application.