Hello, I bought a decent $30 pH meter for water testing. I calibrated it using the 3 pH solutions enclosed. No problems so far.
My tap water tested 8.03 pH . So I adjusted my last watering to 6.5 no problems again.
But then I pulled a new sample from the tap this morning and took it into work to test on our $2000 pH tester. It tested at 7.53.
So here is my technical question: I know pH changes the more you let the water set out to where dissolved CO2 for example volatalizes out into the air etc and this can change the pH.
So, should I err on the side of caution and shoot for a slightly higher ph with my home cheap pH meter?
Thoughts or suggestions???