Although there are ways to get around this, a 2022 paper by Maja Škiljo and colleagues in Sensors covers an interesting way to make use of this signal attenuation property of changing moisture ...

When your residence has soil moisture sensors embedded that were dictated by your friendly neighborhood HoA, you may start asking questions about the system used. That’s what [Modest Maker] did ...

WHAT CAN WE DO FOR YOU: Our bathroom exhaust fan motor replacement kit + humidity sensor switch combo, it can automatically detects the humidity level in your bathroom and turn on the exhaust fan ...

Moisture meters measure the moisture content in bulk solids ... Mounted transmitters do not include a display, but provide an integral sensor or probe.

Hygrometers and humidity measurement instruments test for absolute humidity, relative humidity, or dew point in air. The range humidity measurement instruments operate in is typically from 0 to 100% ...