lol the age old question
. There really is no right answer here. Some strains like the soil quite dry, others a bit soggy, and the rest somewhere in between. I got tired of trying to figure it out and just started keeping everything evenly moist all the time, and I'm in cloth pots, so it's harder to overwater.
I do use the cheapo sticks just to see what's going on, and to check on my dripper timing, but to be honest, I really don't pay a lot of attention to the pots anymore other than a spot check every so often.
What I do pay attention to is RH. When my RH climbs, I probably need to turn the drippers down, and more often, when it drops too low, I need to up the dripper times.
I try to build all my roots before flip so I don't have to do the wet/dry thing. The leaves will tell you if the plant needs water. Right now my drippers come on for 4 minutes at 0600, 0900, 1100, 1300, and 1600. The lights come on at 0600 for 12 hours.
That being said, when the top of my pots show dry, quite often the bottoms are good or even wet still.
Other than the surface, I try to not let anything actually dry out.
I have noticed that just before the drippers come on the meter shows the very low side of green and sometimes even into the dry zone a smidge , at about half way down they go optimally green again.
Every couple weeks I turn autowatering off and let them dry a bit deeper, just to see if the soil is going crusty.
Thats for 10gal cloth pots.
I use these to spray. The nozzle is adjustable from dribble to mist to spray to a straight out jetstream. 1.5 litres I think is the capacity.