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Do not calibrate in distilled, deionized or reverse osmosis water! The pH measurement is an electrical measurement. Typically a pH electrode needs a minimum of 100 uS/cm of conductivity to work. RO water is between 20-30 uS/cm. High purity KCl would have to be added to measure and even then the...

If you do not purchase storage solution then use pH 4 buffer. If you do not have pH 4 then use pH 7. Storage solution is the best since the solution has microbial inhibitors to keep stuff growing. pH 4 is an alternative since bacteria do not grow well at low pH's. It is the reason it is common...

I was just pointing out the pH of common household items is not intended to replace pH calibration solution produced by reputable manufacturers. The only way to know the true pH value is to have a known reference standard. I agree that buffer is cheap enough to buy as a prepared standard. If...

PH calibration solutions are buffers meaning they are buffered against changes in pH by other substances. Do not use RO, distilled, or DI water to calibrate. They have no buffering capacity meaning that CO2 in air will form carbonic acid which will add hydrogen ions. The pH will decrease and not...

Crack the internal glass stem of the ph indicating probe and the reading will be frozen. Meaning no matter what solution you put it in (acid like o.j.) will show ph 7. If a ph probe is stored incorrectly, for example with nutrient solution not rinsed off, the there will be growth on the ph...