Problem with Hannah checker

[Surfside74]

Good evening,

I have a Hannah alkalinity checker and I am having an issue with it. It seems that the reading is constantly off. I have a hydros iv pro and it says my alk is about 10. The Hannah checker says it’s about 7.8. I used another two test kits of different brand (sailfert and Red Sea) and they both say it’s about 10 as well. I have switched bottles of reagent thinking I got a bad batch but I’m on my third bottle and the readings still don’t add up. Anyone else had an issue like this ?

 

[Koty]

I recommend that you’ll will spend some money and get the Fauna Marin multi standard. That will solve your issue. I think that tropic marine also has a standard like this.