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Almost all, if not all, of the refractometers currently available to the aquarium hobby are designed for measuring saltwater (sodium chloride or brine solution) and not true seawater. Although
seawater is mostly sodium chloride it also contains other elements such
as magnesium and calcium that change the refractive index slightly and
will give a slightly different result. The most common symptom of this difference in refractive
index can be seen when mixing up salt as per salt manufacturer's
instructions and achieving a solution strength where it appears, through
testing, that the levels of elements are lower than stated by the
manufacturer. In actual fact all of the levels are low as the salinity
is not as high as the aquarist believes we have all seen low Ca or Mg
for a given SG with almost all brands of salt. It turns out that a 35ppt solution of true seawater has the same
refractive index as a 36.5ppt solution of brine and so when using a
brine/salt refractometer the salinity is likely to be low by 1.5ppt.
This can be allowed for by the aquarist but only if they are aware of
the difference. After extensive development, D-D's new refractometer
addresses this issue, giving true salinity results when correctly
calibrated and greater accuracy than previously attainable.
Features:
True calibration for Seawater measurement.
A New finer scale running from 20-40ppt salinity (SG 1.015 - 1.030)
20/20 calibration at room temperature for more consistency and accuracy in everyday use.
Full ATC (auto temperature compensation) ranging from 5 to 30 deg C
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