I read somewhere that you dont use distilled water for rinsing or storage. What I do to check my calibration is I set my pH meter in a shot glass of bottled water, then prepare two shot glasses of 4 & 7 solution. After about five minutes, remove and place into 7, wait 5 minutes and adjust. Rinse with tap water and put into the shot glass of bottled water until it stops and then put in the 4 solution for 5 minutes or until it stops, adjusting as necessary. So far it seems to work fine but it helps when I remember to check my mash ph.
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