Kh director calibration

paul01609

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Having a right chew on with this thing,on the sample line I have added every thing up including the filter give me in the calculator 8ml.
primed the line made sure there is no air in at all then emptied it in to a measure cylinder and it shows 11ml
every thing is calibrated right but readings are off 3-4 kh from my hanna.
any idea which number I should use?
 

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