Refractometer D-D Aquarium Solutions

SEAWATER Refractometer from DD Aquarium

What sets our NEW refractometer apart from the rest? You may wonder. Most refractometers available to aquarium enthusiasts are designed specifically for measuring saltwater (sodium chloride or brine solution), not actual seawater. While seawater is primarily made up of sodium chloride, it also includes other important elements like magnesium and calcium. These elements can slightly alter the refractive index, leading to different results.

The most common issue caused by this difference in refractive index becomes apparent when mixing salt according to the manufacturer’s instructions. Often, the resulting solution appears to have lower levels of elements than indicated. In reality, the levels are indeed low if salinity is not as high as the aquarist believes. Many of us have encountered low calcium or magnesium readings for a given specific gravity (SG) across various salt brands.

It is interesting to note that a 35ppt solution of real seawater has the same refractive index as a 36.5ppt solution of brine. This means that when using a brine or salt refractometer, salinity readings may be underestimated by 1.5ppt. Aquarists can account for this discrepancy, but only if they understand the difference.

After extensive development, our new DD refractometer addresses this issue, providing accurate salinity results when properly calibrated (using osmosis water) and offering greater accuracy than previously possible.

Characteristics:

• True calibration for seawater measurement.
• A new finer scale ranging from 20-40ppt salinity (SG 1.015 to 1.030).
• 20/20 calibration at room temperature for improved consistency and accuracy in daily use.
• Full Automatic Temperature Compensation (ATC) ranging from 5 to 30°C.

** Calibration with osmosis water, manual is located under the foam rubber in the lid. **