MG/Pre-Fert Soil Users: I gotta ?

[bigtopsfinn]

I agree. I use a cheap moisture meter. 8 inch metal probe that has 3 readings: Wet-Moist-Dry. I water, when it's says DRY.
(at the bottom of the the pot)

Where'd you get it? Is it something from a hydro store, or just like home depot/walmart?