Two Little Fishies AccuraSea Seawater Reference and Calibration Solution

AccuraSea Seawater Reference Solution from Two Little Fishies is the calibration solution of its kind! Made from pure natural sea water, it has been micron filtered, UV sterilized, and then adjusted with reverse osmosis water to the standard S = 35 or conductivity of 53 mS/cm at 25C(77 =F). This versatile fluid can be used to check the accuracy of swing-arm hydrometers, calibrate seawater refractometers, or even as a reference for test kits!