A few thoughts on determining how moist the soil is. Moisture meters are not always accurate although they appear to be scientifically so. They measure conductivity, not moisture directly. The premise is that wet soil conducts electricity better than dry soil. That's true, but how compact the soil is and the mineral content of the soil also affect conductivity. Thus, the meters may be accurate with some soils, but not others. The problem is that we allow them to overrule our common sense because they seem to be so scientific.
Determining moisture content by weight is very subjective. Weight can be affected by soil density and other factors. Until you know how to associate a particular weight with the soil moisture, you are simply guessing.
I do think the old fashioned finger in the soil is still the most reliable way to go, although that too has a learning curve. The bottom line is that there is no easy and completely accurate method for determining the moisture content of a plant's soil. It takes some educated guesses, some mistakes, and understanding that what works for me may not work for others.