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One of these might work for you:

https://m.fr.aliexpress.com/item/32689223035.html?html=stati...

https://www.amazon.fr/Corrosion-Resistant-Capacitive-Moistur...

If not I run www.openagriculturesupply.com amd would love to help find something that does.

I have a couple of these hooked into an rpi zero to monitor soil moisture under my house. They work, but wireless would be much better.

I should have linked these for you in the first place. They have a whole ecosystem of sensors that are all wireless.

https://www.seeedstudio.com/SenseCAP-S2105-LoRaWAN-Soil-Temp...

Often these moisture sensors (and other sensors here) can have high rates of error. Just something to keep in mind if you use it in a professional setting. But if they are cheap enough you can probably normalize out the variance and get a better reading.

I just want some for my garden lol