Waterbox Refractometer


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Waterbox Refractometer

Designed for Saltwater Aquariums

The Waterbox Refractometer is designed for testing the concentration of salt water. Its dual scale provides a direct reading of the specific gravity and concentration (Parts per Thousand) of salt in water. It provides reliable refractive index and salinity readings of total dissolved solids of aqueous solutions.

The Waterbox Aquariums® Refractometer is ideal for measuring salinity in saltwater aquariums. Whether monitoring your aquariums salinity or mixing a new batch of saltwater a Refractometer is a must have for every saltwater aquarium owner.

A common mistake hobbyists make is purchasing a refractometer designed to measure salinity in brine. Using the incorrect Refractometer will give you incorrect readings. Our Refractometer is designed to measure seawater and will provide accurate readings whether you are testing your aquarium or a new batch of saltwater.


Designed specifically for measuring seawater
Dual measurements in SG or PPT
Integrated Automatic Temperature Compensation
Sturdy and light weighted Aluminum body with rubberised grip
Adjustable focus eyepiece with rubber grip
Easy to focus and calibrate
Accurate testing results
2 Year Standard Warranty


What’s Included?

  • 1 x Salinity Refractometer
  • 1 x Instruction manual
  • 1 x Mini screw driver
  • 1 x Pipette
  • 1 x Storage Case/Box

Seawater vs Brine

Salinity is a general term describing the concentration of salt in water. However, solutions of different type of salts have different refractive indexes.  Brine is a solution of Sodium Chloride (table salt) that contains 2 chemical elements.  Seawater contains approximately 70 chemical elements that include Calcium, Magnesium, Potassium etc. in addition to the Sodium Chloride.  Seawater and Brine of the same salinity (i.e. the same weight of salt/liter) have different refractive indexes and will give different salinity readings if measured on the same refractometer.