it's a glass tube and it has different glass spheres in it that rise/ fall acc to temperature and the spheres are all diff colours , not cycling related at all btw
My brother-in-law has one of those thermometers. I thought you read the temperature as the sum of all the numbers on the floating bulbs, but that would make it way over 100 celcius. Then I realised it's just the lowest floating bulb you look at.
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