Okay, so I finally have the darn thing calibrated properly. Now I'[ve got another problem.
I've made a topical solution containing vitamins, minerals and amino acids. Whenever I buffer it to PH7, and I then leave it at RT for a few days, the PH is somehow magically gone up to 7.5 or 8.0.
How can that be??
It cant be the PH meter because whenever I test it on the calibration fluid its spot on