You'd be much better served getting a freshwater aquarium ph test kit, ($7.00 or so) or a ph pen if you can afford it. Either way, find out your water ph asap. Not an emergency yet, but the potential for BIG problems is there, and knowing your accurate ph is essential. Most folks in the USA can go online and check their local municipal water quality report. It'll have all your ph info there and is at least in the ballpark of accuracy. Google "Water quality report" and your town's name and and your state. For instance, mine would be Water quality report East Anytown, Arizona. Or something like that.

Those soil probes are the most unreliable pieces of crap I've ever purchased for the grow room. Absolutely useless. (no offense intended, lol)
Rusty Trichome Reviewed by Rusty Trichome on . Pls. help yellowing with little growth Kush Bag seeds 1st time grower I have a Cfl set up with 3 100 watt 6500k bulbs MG soil time release mixed with some speg. peat moss 12"L x 12"w x 18"h box with foil for reflection Rating: 5