Hanna Alk Egg lower reading than

[piranhapat]

I been noticing my Alk Hanna reading are a little off. Tried another reagent was still different than Salifert and Red Sea reading . They were always close but now full 1 dkh. So Salifert reading 8.6 and Hanna 7.6 So I tested a new saltwater mix and again the egg comes up low. Reading 8.0 and salifert 8.6 which is where new mix should be in range of. Red Sea was giving me even higher reading 9.0 Elos still trying figure that one.

 

[Chefjpaul]

Did you check if it was one of the bad batches?

https://hannainst.wufoo.com/forms/w1hzjs2j1b4ejyu/