A cryometer is a thermometer used to measure very low temperatures of objects.
There are many types of devices used as cryometers:
- thermocouples: these can be used down to measure about 1 K temperature;
- vapour pressure thermometers: these can be used to measure temperatures down to about 0.5 K;
- resistance thermometers: these can be used to measure temperatures at 0.01 K.
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