Hanna Magnesium tester

acropora4u · Apr 9, 2025

wow, I don't know about you but for me- this thing is over 300 points off from salifert and apex trident....you?

acropora4u · Apr 9, 2025

I was getting reading of 1650 to 1700 on hanna and 1300 to 1375 With salifert and apex trident

jrloyd · Apr 9, 2025

I tried my Hannah tester two times. First was flashing 1800. Tried it a few days later and it was 1750. I’ve never used a mg supplement, only do weekly water changes of about 10%. I’ve decided it is horribly inaccurate

GardinersReef · Apr 9, 2025

1600-1700 on Hanna, 1475 on Salifert. Salifert is in line with ICP.

acropora4u · Apr 9, 2025

yes, we should all get a refund from hanna

GardinersReef · Apr 19, 2025

I had an ICP done and it confirmed the Hanna was Mag test was off. The ICP also confirmed my salinity was high. My Hanna salinity pen had drifted a ton. It reported 1.025 but it was actually 1.033. Now that my salinity is correct the Hanna Mag test seems to be accurate again.