Hello everyone! I recently purchased a GHL KH Director unit. I have been a hanna checker test for a few years and im sure this question has been tossed around a few times. This past week i have noticed a issue with my dKH testing. One day its 8.7 and the next day its 8.9. Its been a solid week with this up and down. Today i noticed my corals (full sps tank) not looking so happy. Checked dKH on the GHL app and got 8.9 dKH. Decided to test with the Hanna tester and got 7.2 dKH, wait what? I keep my tank stable at 8.3-8.5 dKH. I have watched numerous videos on setting this unit up and calibrating everything properly. I understand the testing method/peocess is completely different between the two but i would expect somewhat similar results. Any advice on next steps would be greatly appreciated. I do apologoze for this lengthy post.
Thank you.
Thank you.