- Joined
- May 31, 2020
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- 128
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- 130
Testing a refractometer with rodi tells you almost nothing. They can be off significantly at 35ppt and still read 0 at 0 (or read zero at 10 PPT). Calibration solution is like $8 for a big bottle.
Refractometers get used for things that need way more precision than a reef tank does. Calibrate it (at 35 PPT!)regularly. Use it. Don't worry too much.
I guess I should just stop using the Hannah checkers then. focus on consistent 35 ppt with the refractometer