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I also ordered a set of coffee scales to improve the calibration process for the KHD and the dosers .... I guess it might also come in handy once my IonD arrives

Vinny posted this

In addition to putting the filter at the end of the sample tube I found tiewrapping the filter in a 25mm pvc tee helped the consistency (and kept the filter where I wanted it)

I found a standard graduated cylinder accurate enough to get whole number accurate but it would be interesting to know

Then I can only suggest raising a ticket to verify the probe is not faulty .... sorry

BTW my waste output is much less than reported too ... to answer the final question in your original post

So you've consumed 320ml of reference solution?

What sample volume are you using?

That's 10, 10, 10 and 10

Consistency is the key ... my KHD records between 9.5 and 10 testing twice a day. Recent Triton N-Doc test shows 9.8.

I could never get Hanna tester to agree so stopped using it.

If the KHD is...