specific gravity

  1. johnf3

    33 ppt = 1.026 sg???

    Hi all For the past couple years I’ve only been using my good old refractometer and calibrating it with 35ppt solution to measure my salinity in tanks and when mixing water. It has always worked well for me and is my standard for mixing water. Well recently I purchased the Hanna marine...
  2. Measuring Salinity / Specific Gravity in Aquariums

    Measuring Salinity / Specific Gravity in Aquariums

    Salinity Measurements for Marine Aquariums @Jay Hemdal Introduction The fundamental difference between freshwater and marine aquariums is of course, their respective salt content. The salt level is usually reported as either salinity (parts per thousand of salt in water) or specific gravity...
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