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number1gsxxr
Guest
Like the title says, how often should you calibrate your refractometer?
There was an article somewhere ( Advanced aquarist? ) that recommended against using RO water to calibrate.
Anyone know why?
I just bought some distilled water and used that for calibration when I got the thing about a year ago. Haven't tested it since so I just did it again (with the same water) and it is exactly where I set it a year ago.