They also work great for other things…
Scored this haake-110 for $800. It only got down to -30 until I replaced the condenser fan. Now it freezes my hexane without hesitation. I also get no detectable vapors from my dry scroll pump.
It was kind of to good of a deal to pass up otherwise I would have picked a different temp, but I use with with my vacuum oven and rotary dryer.