This one appears to be a different model of a Minox thermometer, with a different case too. I would say that it’s a later model, as the Minox logo and the metallic reinforcement bit are not present. The case is different, a yellow plastic tube, with accommodating plastic spirals on both ends.
No idea if these were sold separately (probably they were), this thermometer was bought as singe item, not part of a Minox daylight developing tank.
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