Lumicon Temp Probe for Hyper Kit Question

Has anybody had trouble with the 50 degree temp probe that goes with the Model 300 hyper kit? I am on my second one in 5 years and that one has now apparently failed. It has not been dropped or otherwise abused.

Since Lumicon is now out of business and I may not be able to get a replacement probe, anybody else want to share with me on how they regulate the temperature for hypering film?

Thanks

Chris