My Hanna checker recently did the EXACT same thing.
My measurements were very similar to yours. Just thought I was getting ready to go through a huge growth spurt until I noticed a few burnt tips.
I checked with my salifert as well and my dkh was 11. I threw out the Hanna reagent I was using and tried a brand new bottle of reagent. The new bottle reading was 11....same as the Salifert.
At some point, the reagent went bad. And not because it was expired, I check Alk frequently so I go through a fair amount of reagent.
I should have recorded the defective reagent's lot number. I bet your lot number would have been the same as mine.
I'm going to contact Hanna to see if they've had any other reports.
My measurements were very similar to yours. Just thought I was getting ready to go through a huge growth spurt until I noticed a few burnt tips.
I checked with my salifert as well and my dkh was 11. I threw out the Hanna reagent I was using and tried a brand new bottle of reagent. The new bottle reading was 11....same as the Salifert.
At some point, the reagent went bad. And not because it was expired, I check Alk frequently so I go through a fair amount of reagent.
I should have recorded the defective reagent's lot number. I bet your lot number would have been the same as mine.
I'm going to contact Hanna to see if they've had any other reports.