A shaft frequency analyzer. I don't need it, but what the heck. Someone had listed a used one for $75 shipped, and there is a secret $25 ebay code (HAPPY25) going around. Code works for some, doesn't for other. I put the analyzer in my cart, applied the coupon and it worked for me (my wife wasn't so lucky). So, in the end it was $55 shipped. I hope it works, and if it does, I hope I can figure out how to use it.