On Tuesday, February 23, 2016 at 9:44:54 AM UTC-5, John Kuthe wrote:
>
> I bought a new backup candy thermometer when the mercury in one got an air bubble in it. Not sure how that happens, but that's an anomaly I don't trust.
>
> John Kuthe...

You can get rid of the "bubble" either by shaking the thermometer or putting it in the freezer. It should then be fine. However, I don't blame you for not trusting it.

http://www.richardfisher.com