The Sensiron SHT45 precision temperature and humidity sensor got featured here a couple of years ago, and wonderful Adafruit has picked up on it, and not only produces SHT4x breakout boards (right), ...

This humidity sensor consists of 2 copper conductors that are located at small distance from each other. The relay switches as soon as the moisture makes a connection that is more or less electrically ...

Increasing focus on compact digital humidity sensors to enhance efficiency and simplify device design Capacitive type humidity sensor to hold the highest market share during the forecast period.