I have one, although have not had it for long. The first probe had to be sent back to American Marine. I would not calibrate.
I contacted Lou from American Marine and he sent me a new probe and a generous supply of calibration solutions.
It works fine now!!!!
As to the comment "It Sux", can't say that applies to my situation. It has been working perfectly for me. I must say, it does save a lot of time when testing.
I personally like it.
Marinworld