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I have some Fisher 4,7 and 10 pH buffer solution. These have color added to them. Are they fine to use to calibrate the pH probe? I also have a pH 4 that does not have color added to it. I already have my probes calibrated with the Neptune solutions so i may just stick a probe in and see if it reads the solution accurately.
https://www.fishersci.co.uk/shop/pr...thalate-red-nist-standard-solution-2/10427260
https://www.fishersci.co.uk/shop/pr...thalate-red-nist-standard-solution-2/10427260