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
    £11.99
  2. Red Sea Seawater Refractometer
    Red Sea Seawater Refractometer
    £52.99
    Out of Stock Online
  3. refractometer in a plastic box - black
    Aqua Marin Refractometer
    £34.99
    Out of Stock Online

For delivery before Christmas, orders must be placed on or before 3pm on Wednesday 20th December. We cannot guarantee delivery of these orders pre-Christmas as we are reliant on our couriers, but will use our best endeavours to get orders placed on this date out to you before Christmas. For full details of our festive delivery and opening times click here

Please note: online orders placed after 3pm on Friday 22nd December will not be dispatched until the New Year. For full details of our festive delivery and opening times click here