Oh you may be exactly the person I need to talk to! I'm looking for a soil humidity sensor that is able to permanently sit in my garden and accurately measure s

Oh you may be exactly the person I need to talk to! I'm looking for a soil humidity sensor that is able to permanently sit in my garden and accurately measure soil humidity and soil temperature. Do you have any advice? Currently I'm using this one: https://www.adafruit.com/product/1298 https://www.adafruit.com/product/1298 But after 3-4 waterings, it reads 95-100% consistently, regardless of the temperature. I've tried 2 of their sensors and have had the same problem.