Ph meter calibration

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stubrewworx

stubrewworx

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I have This.

Any idea how to calibrate?

I've followed the instructions. The 1st step 6.86 seems to go ok, but after that.....!

The meter doesn't read 4.whatever or 9.whatever in the other solutions. Going back to 6.86 reads ok, but then my mash read 6.55. Which I hope is incorrect?

Any advise would be appreciated.
 
Using some 4 & 7 buffer solution, should be quite straightforward.

I think it's a call to mm?

Trust your mash, not the new gadget.
 
I've had it while and yeah I trust my mash, but curious about the finer variables of a hobby laden with variables!
 

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