This specialized device was made by the U.S Navy to test potential Operation Specialist. It is a radar training device that test skill and accuracy. The metal tipped pen starts in the center and the goal is to follow the spiral outward as fast as you can without going off the copper rail. If one happens to do that (high probability) it will buzz loudly and keep track via the counter. I was finally able to identify this device when speaking to an old retired Naval officer that had taken this test and had no luck passing . In working condition with natural wear and the tip of the toggle is chipped but you can still turn it off and on. This is one of those listing that I will only have up for a limited time. Measures: 14” x 10” x 3”