The Vee Gee line of handheld analog refractometers are very simple to use and provide quick and accurate measurements for the concentration of nearly any aqueous solution. Just place 1 or 2 drops of your sample on the prism, close the daylight plate over the sample, and look through the eyepiece for your reading.
Water Quality Test Strips, Water Quality Test Kits, Water Quality Instruments
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Industrial Test Systems, Inc., Water Quality Test Strips, Water Quality Test Kits, & Water Quality Instruments