You have no items in your shopping cart.

Seawater Refractometer D-D *OUT OF STOCK*

Accurate and true measurement of the 'Seawater' salinity.
Old price: $109.00 incl GST
$98.80 incl GST
What’s different between D-D's refractometer and others you might ask?
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.
Incorporates ATC (Automatic Temperature Compensation)
Customers who bought this item also bought

Reef Putty Nyos Stone Grey 200 gram *OUT OF STOCK*

$34.90 incl GST

or 6 weekly interest-free payments from $5.82 with what's this?

Reverse Osmosis System Dupla RO300

$399.90 incl GST

The reverse osmosis draws pollutants (eg silicate, nitrate) and hardness-causing agents out of the water physically. In the reverse osmosis system

or 6 weekly interest-free payments from $66.65 with what's this?

Seachem MultiTest Nitrite and Nitrate

$48.90 incl GST

To test Nitrite and Nitrate in Marine and Fresh water.

or 6 weekly interest-free payments from $8.15 with what's this?