PK1
Supporter
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ok keep your ph pen in your ph 4.01 solution and grab the screwdriver that came with the ph pen and adjust the number to 4.01
However, you have to make sure that you are following the instructions on the packaging. Temperature and volume of water matters for calibration.
Once the number settles on 4.01 then you are golden.
update:
i just read the post that you mentioned that it doesn't have a screw in the hole. That's odd?
However, you have to make sure that you are following the instructions on the packaging. Temperature and volume of water matters for calibration.
Once the number settles on 4.01 then you are golden.
update:
i just read the post that you mentioned that it doesn't have a screw in the hole. That's odd?