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 ...

Common “soil moisture meter module arduino raspberry compatible ... what it takes to build a soil-embedded sensor that can actually survive contact with a plant. As the picture might hint ...

Use the XLUX soil moisture meter to check whether your garden needs watering. The sensor has a basic single probe design and a color-coded dial display. It works without batteries, so you never ...

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