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  1. R

    calibrate at 7ph first then 4?

    Thanks alot for your answer
  2. R

    calibrate at 7ph first then 4?

    Hi I'd like to ask if its an golden rule to first calibrate at 4.01ph and then 7.01? My profilux ask for 4ph water first when i calibrate my electrode. But i read somewhere that if calibrating with 4+7water always do 7 then 4. If calibrating with 7+10 water do 7 then 10. Reason I ask, my tank...
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