Ok I wanna post a question on ph pen calibration. How When. And what do I need my directions say I need deionized water and buffer solution I have the buffer but not the water is ro or distilled just as good or should I just buy the ready buffer from the hydro shop What do u guys do when it come to re calibration
I used to use water from my dehumidifier. It was ~15ppm and my tap water is 160ppm. I'd let it set for a few days to let anything in it settle then pull some from the top. My pen required calibrating at three different pH levels also. A good rule of thumb is to calibrate it once a month, cheap pens more often.
That being said I quit using a pH meter over a year ago. I switched to a pH buffered nutrient line...to say it was a game changer is a vast understatement.