We are now using a soil moisture sensor which has been made in house, I have done lots of experimenting with different materials.
Welcome to Weather-Above
I am currently testing a new soil moisture block they have been in the ground for over 2 1/2 years and the results are outstanding

I have some volunteers who are currently going to test the soil moisture block in different areas and soil types , after the testing has been completed this web page will be updated on how to make them for yourselves

Thank you
Michael Parry-Thomas