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(calibration) temperature. For each °C higher than the reference temperature, a temperature coefficient is subtracted from the value; for each °C lower than the reference temperature, a temperature coefficient is added to the value. Model NDX-1 can be used for measuring both water-based solutions and oils. The coefficients used for temperature correction on oil-based solutions are slightly higher than those used for water-based solutions (see upper right corner).
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Introduction General Use Thank you for purchasing this VEE GEE Refractometer. With the user in mind, VEE GEE Refractometers are built from modern Open the secondary prism and apply one or two drops of the sample solution to the surface of the primary prism. Hold the refractometer at an angle close to designs and, with proper care, this instrument should provide many years of reliable performance.