Designed specifically for aquarium
use to measure the salinity of natural sea water (NSW). Most handheld saltwater refractometers available in the hobby are designed and calibrated for testing brine solution, i.e. sodium chloride, and are not calibrated for the refractive index of natural sea water. This is a very important distinction: other salinity refractometers
used for marine aquariums are designed to test saltwater and nothing else! The Marine Depot Aquarium Pro Refractometer is designed to measure the salinity of NSW taking into account all the other elements that comprise salinity in the marine water sample.
Even though the largest percentage of salt in the sea is sodium chloride, the presence of other significant ions such as magnesium and calcium in NSW results in a different refractive index to that of brine. A standard (brine) refractometer will therefore not give the correct salinity for NSW and a conversion factor must be applied.
For example, a 35 ppt (parts per thousand) solution of NSW has the same refractive index as a 36.5 ppt solution of brine. When using a brine refractometer, an aquarium hobbyist should therefore look for a reading of 36.5 ppt when trying to achieve a reading of 35 ppt for NSW.
Easier to Read
One of the other problems with most refractometers is the scale displayed normally reads from 0-100 ppt when we are really only interested in the region from 30-40 ppt. The Marine Depot Aquarium Pro Refractometer has therefore been specifically designed to read from 1.015-1.030 which gives you much better resolution of a normal 1.000-1.070 scale.
- Marine Depot Aquarium Pro Refractometer
- Protective Hardshell Case
- Soft Cloth
- Calibration Screw Driver