Refractometers & Hydrometers

Refractometers and Hydrometers are both used to measure salinity. The refractometer is the more accurate of the 2 and works on the principle of light refraction through liquids. The refracted angle will be shown on the scale to determine the amount of dissolved salt in that sample. A crucial bit of kit for any marine keeper. 

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Showing 4 Products

  1. Fluval SEA Hydrometer
    Fluval SEA Hydrometer
    £9.99
    Out of Stock Online
  2. refractometer in a plastic box - black
    Aqua Marin Refractometer
    £34.99