Crap. I just answered your other post, and asked for some of this info...

I never met a soil probe I didn't want to chuck against the wall. Most are garbage, especially the cheapies from Home Depot or WalMart.
You can not accurately test runoff ph with a color-coded drop test kit. The tinting of the water from the soil and nutrients skews the results. Best use for the color-coded test kits, are simply to determine your tapwater ph before and after adjusting. But again...if trying to ph the water after adding deeply colored nutrients, your results will not be accurate. A ph pen is the most accurate ph tool, but is costly to purchase and maintain. (compared to soil probes and drop-test kits)

Keeping fingers crossed for ya...
Rusty Trichome Reviewed by Rusty Trichome on . Fixing soil grow PH level I'm a newb and in 3rd week of seedling (NL) grow in 1 gallon pots each about 3" tall with multiple leaf sets, Leaves turning yellow. Followed threads on this subject and checked PH level in soil two ways: 1st with probe and reading was above 7 and 2nd test with, test tube and result was same reading as per color chart of above 7 maybe close to 8 ... Holy !!! WOW !!! Too High from what I am reading/learning. Anyhow I added 2tsp. of sulfur granuals to each pot and mix in and then watered. Hope Rating: 5