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From their description and a video I saw somewhere, you can calibrate it. I did misspeak when saying it came with calibration standard, as it doesn’t appear that it does. See pic from the description on BRS site as well as Hanna’s site. Their wording says the unit will guide you through calibration. Now, I don’t have it, so I can’t guarantee it based on my usage, but it says what it says. https://www.hannainst.com/marine-master-waterproof-multiparameter-photometer-hi97105.html
Hanna seems to have an odd idea of what a standard is , IMO.
A standard should test the method for accuracy. Hanna standards do no such thing.
They are just colored water that tests if the photometery is functioning correctly.
If the reagents were off for any reason, or the user is using them incorrectly in any way, there's no way to know.
Reefers would be FAR better off if they provided one or several actual standard solutions to actually test to see if it was working. Like a seawater phosphate solution containing 0.1 ppm phosphate, or a seawater sample with 410 ppm calcium in it, etc.