Thank you very much for answering. That's what I wanted to know about liquid compasses. I guess mineral oil doesn't freeze easily and I guess they add alcohol to it too. I'm far from complaining about the package which is really smartly designed and I'm pleased with the compass now that I know that it has been tested to -20F. You've done a great job and I'm very thankful for it. I don't often buy products and ask questions to the designer. That's wonderful.

I don't know much about compasses in general. I'll try to read some documentation about dry compasses versus liquid compasses.

Thank you
Frankie