Seems like everyone is stating the use of this probe will be just for monitoring and setting up actions against it would not be advisable. Even if it is not perfect I like that I can set an alarm for my set point and if it goes of I can do a manual test. That with periodic schedule manual testing, should keep thing very stable. Unless of course the probe happens to drift at the same rate as the tank if there is a problem. All in theory of course, my probe is still in the package and is still a few done on the to do list. Right now I'd be happy if my temp probe actually worked.