Who has/uses them. Quick search doesn't show any that go below -20. Recomendations?

I had one a few years ago. It went to -20. Ended up getting ripped off. I mounted an aircraft thermometer on my handlebars that goes to -60. A lot easier to see while riding. With engine running and warm it would run about 10 degrees warmer then actual temperature.

I have one, hanging on some elk horns in my bedroom. Used to have it on a backpack back when I was in Boy Scouts as a teenager. Hadn't used it in a lot of years and came across it a couple years ago and hung it on the horns to see how much colder it was in the bedroom (coldest room in the house) and there it hangs. I think it also goes to -20. Never tried it on a coat or anything, figured it wouldn't be at all close to accurate with the body heat.

i use one on my refirdgeaware. Now i know why it is never colder than -20 on my trapline. I just always thought i was in a warm valley.