View Full Version : Red Sea vs. Hanna

06/09/2014, 09:07 AM
So i have been using red sea test kits for the standard Alk, Clac, and Mag. I recently purchased Hanna Checkers for the Alk and Calc tests.
When testing calcium i am getting a reading that is some 100 points in difference (Hana higher).
Just wondering what am i doing wrong with either test or what one should i use as the more reliable one.
from a directional standpoint - that has been consistent.
Thanks in advance!!!

06/09/2014, 09:12 AM
I haven't used the calcium Hanna checker myself but I know a lot of reefers have issues with them reading incorrectly. The Hanna checkers are good for phosphate and alkalinity, but less so for calcium.

06/09/2014, 09:15 AM

06/09/2014, 09:44 AM
FWIW,I don't use the calcium checker but have satisfactory results with the hanah 713 for PO4 and the alk checker.The Salifert test for calcium works well for me.