What is "cryometer"

cryometer \cry*om"e*ter\, n. [Gr. ? cold, frost + -meter.] (Physics) A thermometer for the measurement of low temperatures, esp. such an instrument containing alcohol or some other liquid of a lower freezing point than mercury.

n. A thermometer used at very low temperatures.

n. a thermometer designed to measure low temperatures

A cryometer is a thermometer used to measure very low temperatures of objects.

There are many types of devices used as cryometers:

1. thermocouples: these can be used down to measure about 1 K temperature.
2. vapour pressure thermometers: these can be used to measure temperatures down to about 0.5K
3. resistance thermometers: these can be used to measure temperatures at 0.01 K.
4. melting curve thermometers: these can be used to measure temperatures between about 0.001K and 0.5K
5. resistance noise thermometers: these can be used to down to about 0.001K
6. magnetic thermometers: which are used at 0.001 K temperatures.
7. nuclear-resonance thermometers: these are required to measure very low temperatures such as 0.0000001 K.