The EC 2.77 is not for the Ph pen all you need to calibrate the Ph pen is the 4.0 and 7.0
the 2.77 is for their Electrical Conductivity pen that measures EC or Ppm
The EC 2.77 is not for the Ph pen all you need to calibrate the Ph pen is the 4.0 and 7.0
the 2.77 is for their Electrical Conductivity pen that measures EC or Ppm
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