I have 2 head units,one transducer, and 2 probes. I purchased off another LOU member a few weeks ago. I have not installed this unit to make sure it works but he said it worked fine. The transducer is chipped where the wheel attaches see attached photo. The extra head unit was off my boat. my unit didn't read anything but surface speed that's why I bought the other unit. I figured it was the probe. I did try the probe but has the same results so I just went with a brand new unit. 200 bucks