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I have had some fluctuating results on my KHD so dug out some reference solution set at 7dkh and thought I would test the how accurate the KHD, I did not have much faith in the KHD performing well due to my previous results.
KHd Result was 100% accurate.
I will perform a couple more test before I say it was a complete success!
@GHL can I use this method as a indication for when I need to calibrate the KHD?
Attachment 10311
Second test done with 7kh Ref solution
Result 6.4KH
Attachment 10316Attachment 10316
So it seems your getting a low reading of - 0.6KH, this seems to be where mine is as well when cross referenced with my hanna and Elos kits, trouble is which one is correct? At least my results are consistent, when not affected by micro bubbles.
Mine seemed to be ok for a while then I came home and the KH dropped to 7.6 I checked with a test kit and it should have been 8.2kh I then ran the reference solution on the KHD and it was reading -.6
I ran the KHD and it went up to 8.6kh
I Only test once a day so will see what it is like tommorrow