AccuraSea Saltwater Calibration Solution - Two Little Fishies

AccuraSea Saltwater Calibration Solution is Two Little Fishies' answer to the problem of instrument drift and measurement uncertainty in reef and marine aquariums. Salinity measurement errors compound quickly — a miscalibrated refractometer or an inaccurate hydrometer can quietly push a tank outside the parameters its inhabitants need. AccuraSea addresses this by giving you a reference point built from the real thing: natural seawater, not a synthetic salt mixture.

The solution is processed through micron filtration and UV sterilization to remove particulates and biological contaminants, then adjusted with reverse osmosis water to the internationally recognized standard of S=35, equivalent to a conductivity of 53 mS/cm at 25°C (77°F). This puts it in line with the salinity standard used in oceanographic research, so you are calibrating against a value that is both meaningful and well-established rather than an arbitrary target.

Beyond salinity instruments, AccuraSea can serve as a reference solution for reagent-based test kits. Because it is genuine seawater with naturally occurring concentrations of all dissolved salts — calcium, magnesium, alkalinity, and trace elements among them — you can use it to sanity-check test kit results against known seawater baselines. This adds a layer of confidence that synthetic calibration fluids cannot provide.

Each bottle contains 250 ml of solution, sufficient for repeated calibration sessions over time. Store it capped and away from direct light between uses. This product is appropriate for any marine or reef aquarium keeper who uses a refractometer or swing-arm hydrometer as a primary salinity measurement tool and wants confidence that their readings reflect actual tank conditions.