My Galileo thermometer.....it's a hot day today as it's reading 28ºC. The various coloured globes inside have weights attached to them. As the liquid changes temperature it also changes density and the weights go up or down accordingly. Each weight has a temperature engraved on it and the yellow one at the top in this instance is 28ºC. I find it pretty accurate within the range it covers which is between 16ºC and 28ºC so if it's any cooler or warmer than that, you'd have to refer to a normal thermometer. Looks good though.

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