Psychrometer in a sentence as a noun

It looks like I’m confusing a classic psychrometer with more modern ones. The modern ones still use absorption of water to change some physical property like capacitance or resistance but this is also why they need to be continually calibrated against a true dry/wet bulb hygrometer.

Psychrometer definitions

noun

a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air