I have calibration liquid, but still do a side-by-side comparison with my old stand-by...the (liquid) aquarium water ph test kit. ($6.00) I test the water with my ph pen, then test same sample of water with the test kit. Gives a good idea how close your pen really is. :thumbsup:

I just checked...drain opener has a ph of 12.
Household bleach is a 12.5
Baking soda, 8.4

The MSDS HyperGlossary: pH

A ph of 12 just doesn't seem likely, tho. Even a high-range ph test kit for saltwater aquariums only goes up-to 9.5 or 10.
If your city water is 12, call a lawyer. If you have your own well, and it's at 12...you'll want to look elsewhere for your water.
Rusty Trichome Reviewed by Rusty Trichome on . Help, plants are getting sick (pics) I have 2 White widows in soil. I used some cheap soil with nothing special in it. 80% soil, 20% perlite. the pots are approx 2 gallons. PLastic pots, good drainage, so good i must always dump out extra drainage. -2 tablespoons of fox farm "american" red bag are in the soil too -Im useing botanicareGro and superthrive- 15mlGro/gallon and .75 ml ST/gallon-6.7-6.8PH when watering-I diluted this 2 days ago when i began noticing the problem to half 7.5mlGro/.35mlST -I use distilled water Rating: 5