IceCap Fast Salinity/Temperature Digital Pocket Tester

Salinity while sometimes considered secondary and often taken for granted is crucial to the health of our aquarium inhabitants.

Generally, the specific gravity of salt water is around 1.025 or 33 parts per thousands. While fish can tolerate swings that are higher or lower, most corals and invertebrates are far more sensitive and can stress if exposed to drastic salinity changes. This is the reason why it is so important to make sure that your tank’s salinity is stable and when doing water changes, the salinity of your new water matches the water in the tank.

Some hobbyist test their salinity by using a swinging-arm hydrometer but the problem is that they are hard to read and unless they are kept very clean, the floating arm will most likely render an inaccurate reading. Most hobbyist use a refractometer. Light will refract differently based on the salinity of the water. The problem with refractometers is that they are hard to read, only work in a well-lit environment and they need to be calibrated. Another i