February 23, 2026
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Refractometer Calibration Mistakes That Cause Salinity Swings
Avoid hidden salinity instability with a simple calibration routine for reef hobbyists.
Quick answer
Refractometer salinity swings usually come from residue on the prism, temperature changes, or rushed calibration checks. Rinse with RO/DI water, calibrate with proper fluid, and recheck before mixing saltwater. If readings still drift, compare against another tool and replace the refractometer if needed.
Why Calibration Errors Happen
Residue, temperature swings, and rushed checks can throw salinity readings off.
Fast Calibration Routine
- Rinse with RO/DI
- Use calibration fluid
- Recheck before mixing saltwater
If values drift, compare tools and consider replacing your refractometer.
Log salinity in the ReefBay app to catch trends early.
