Aquarium Hydrometers & Refractometers

Product Code: RES00877
The Coralife Deep Six Hydrometer range is 1.000 to 1.032. The Deep Six is accurate to +/- 0.001 specific gravity.

Product Code: RIC68080
The IceCap Salinity/Temp Digital Pocket Tester is a portable, rugged, water resistant device that utilizes electric conductivity to determine the specific gravity/salinity of natural and artificial seawater. Within seconds, the salinity and temperature are measured and visually displayed on the easy to read backlit LCD screen.

Product Code: RIC68080-Bundle
This package includes the IceCap Salinity/Temp Digital Pocket Tester & Two Little Fishies AccuraSea, 250 ml. You'll need the AccuraSea as a reference solution to calibrate the Salinity Tester.

Product Code: RAS02503
The Instant Ocean Hydrometer (TK-504) delivers precise full-range salinity and specific gravity readings--accurate to 0.001.

Product Code: RMR90001
The MarineAndReef.com Reefractometer is designed specifically for marine and aquarium salt water. The readout is for 0-40 PPT, which is much easier to read than the 1-100 PPT that comes with many refractometers that are for general use. The refractometer also features ATC (automated temperature compensation) so you don't need to adjust your reading.

Product Code: RMR90001-Bundle
With the MarineAndReef.com Reefractometer (aka Refractometer) & Two Little Fishies AccuraSea Package you can be absolutely certain your salinity is perfect.

Product Code: RMI00887
The MA887 Milwaukee Instruments Seawater (Salinity) Refractometer is an optical instrument that employs the measurement of the refractive index to determine the salinity of natural and artificial seawater, ocean water or brackish intermediates.

Product Code: RMI00887-Bundle
This bundle includes the The MA887 Milwaukee Instruments Seawater (Salinity) Refractometer with the Two Little Fishies AccuraSea, 250 ml.

Product Code: RTL50700
With Two Little Fishies AccuraSea you can measure your salinity precisely. AccuraSea seawater reference solution is the only calibration solution of its kind made from real seawater. It’s pure natural sea water micron filtered and UV sterilized then adjusted with reverse osmosis water to the standard S = 35 or conductivity of 53 mS/cm at 25°C (77°F).