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The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Reads in percent and specific gravity. An absolute must for the serious marine hobbyist. The Captive Purity Refractometer is an optical device (no batteries) dual scaled 0-100% specific gravity: 1. 0 to 1. 070. Calibrate with distilled water. Adjustable eyepiece, carrying case, pipette and calibration screw driver included. This model is ATC (automatic temperature compensating).
The new digital refractometers are precision optical instruments used for measuring concentrations of substances in aqueous solutions. They work using the principle of light refraction through liquids. When passing light through a liquid, the test result will be calculated by the computer and shown in the digital display.
Milwaukee Digital Refractometer are very simple to use: simply place one drop of your sample in the prism well, and read the results immediately!
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