PH, Moist & Light

I just found this really interesting soil moisture and i was wondering the best configurations to keep your plant healthy!
http://www.amazon.com/Moisture-Gard...&redirect=true&ref_=oh_aui_detailpage_o01_s00

Those are not all that reliable bud pretty neat though your better off testing your run off with a proper ph pen for moisture lift the pot or stick a finger in the soil down to the knuckle if its dry water if its moist its fine light kelvins nm etc are usually on whatever lighting system you buy save your money and get a good ph pen thats a necessity in this community