伤风 😵😩😷

in #zzan • 6 years ago

伤风 😵😩😷

3 ways to calibrate ORP meter

  1. Quinhydrone
  2. Ferrous cyanide + Ferric cyanide
  3. pH buffer (- 59.1 mV for each pH unit below pH 7)

预测

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6 years ago in #zzan by
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     6 years ago 

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