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https://www.swelluk.com:443/red-sea-refractometer/ 
Red Sea Refractometer
This Red Sea Refractometer helps you test your aquarium water for precise readings regarding it's salinity levels, ensuring you are getting the right salt water ratio in your tank to support your aquatic life. Salinity levels are essential for both freshwater and of course Salt Water tanks.
Product Information
Leaders in the aquatic field, Red Sea have an extensive range of products designed to enhance, develop and maintain your aquarium.
The Refractometer has been developed to the highest standard, and offers a more precise, absolute reading than similar products. It has been calibrated for seawater, at a temperature of 25oC/77oF, to give the most accurate reading. It uses an Automatic Temperature Compensation System for the most accurate measurement at the ambient temperature.
The unit uses refraction to measure the gravity and salinity of salt water, and enable you to study the results in great detail with the built in thermometer. The easy to read display has a high resolution too, so the results are clear to see.
The Refractometer comes complete with a sturdy plastic case to safly house the unit.
Latest Customer Reviews
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Rating Date 03/07/2016 19:07pm Red Sea Refractometer
Good but not quite as good as the one it is replacing -
Rating Date 02/03/2016 20:03pm Red Sea Refractometer
Good quality not used yet -
Rating Date 26/01/2016 05:01am Red Sea Refractometer
Excellent product -
Rating Date 25/09/2015 10:09am Red Sea Refractometer
Superb bit of kit, graduation marks designed for marine aquarium. Well made and great serve from SwellUK -
Rating Date 14/11/2014 23:11pm Red Sea Refractometer
Excellent