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https://www.swelluk.com:443/tmc-refractometer/ 
TMC Refractometer
TMC V2 Refractometer salinity & Specific Gravity is designed to be easy to use and comes in a sturdy plastic storage case. Order online today from Swell UK.
Product Information
The V2 Refractometer is designed for testing the concentration of salt water and brine and is used for quality control in the marine industry and in research and clinical laboratories. The V2 Refractometer's dual scale provides a direct reading of the specific gravity and parts per thousand (ppt) of salt in water.
Product Information:
• High resolution, dual scale - SG and PPT
• Simple focus adjustment
• Wipe-clean lens
• Easy to calibrate - screwdriver supplied
• Simple water application - pipette supplied
• Automatic temperature compensation