Hanna Digital Salinity Tester Calibration?

I calibrate mine about every 5-6 months. Bad I know.

To me it feels accurate. I know how much salt to mix to hit 1.025, I know where the water line on my tank and sump is, I see my ATO reservoir depleting at normal speed, I see my livestock is all happy.

Nothing fluctuates, so I don't doubt the accuracy of the tester, until I do.
 
I recalibrate whenever it gets more than 2 ppm off from what I expect. Usually it happens pretty much all at once every 4-6 months for me.

I know within 1 ppm what my salt mixes to so it’s easy to know when something is off more than that.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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