Small granules formed on the probe when opened. It was found to be dried storage solution which must have seeped through the cap and included o-rings. After calibration, the pH value appears to be displayed accurately after a few seconds. The calibration packages provided are helpful. Don't forget to also buy a 3M KCL storage solution. Vertical storage prevents leakage when opening the package. The block does what it's supposed to, with a few minor annoyances.
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