Lumicon Temp Probe for Hyper Kit Question

The 50 degree temp probe for my Model 300 hyper kit has failed again (second one in 5 years, no idea why). With Lumicon out of business, can anybody tell me how they would regulate the temperature without this probe? Or better yet, where can I get a replacement?

Lost without my hypered Tech Pan

Chris

Here is another site to check out about your problem.
Several people have posted ways to fix this:
http://astro.umsystem.edu/ampl/
Augie