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Milwaukee MR32ATC sugar refractometer
Professional Hand held Refractometers
The MR series refractometers are precision optical instruments used for measuring concentrations of substances in aqueous solutions. They work using the principle of light refraction trough liquids. When passing light trough a liquid the refracted angle will be shown on the scale determining the amount of dissolved solids in the liquid.
Milwaukee refractometers are very simple to use: simply place one drop of your sample on the prism and read the results on the scales immediately!
All these meters have adjustable focus, easy to read numbers for good resolution and zero adjustment screw for calibration.
Each refractometer is calibrated and adjusted to measure at 20 C (68 F). Models with Automatic Temperature Compensation are also available and are suitable for applications where the temperature of the samples vary.
Dimensions 7.6 x 1.5 x 1.5" (194 x 38 x 38mm)
This instrument measures the refractive index of the sample and displays the result in Brix scale.
Put distilled water on the prism; enough to cover the entire prism. Close the cover plate and rotate the adjusting screw so that the light/dark boundary line (known as the shadow-line) evens up with the zero line. After the zero adjustment, clean the prism with soft cloth.
2. Sample Preparation and Reading
To take a reading, place a few drops of a sample liquid on the measurement prism. Ensure that enough solution is added to the prism in order to cover the entire prism. Close the prism so that the liquid spreads across the entire surface of the prism without air bubbles or dry spots (see diagrams below). Allow the sample to remain on the prism for approximately 30 seconds. While holding the instrument under a light source (do not use florescent light) look through the eyepiece. The brix concentration is determined by the intersection of the boundary of the light and dark fields (known as the shadow-line) on the printed scale. If the scale appears out of focus, the eyepiece may be adjusted by rotating the knurled portion. The instrument also features an eye guard to prevent stray light from entering the eyepiece and causing reflections. It may be necessary to adjust the position of the light source to maximize the contrast of the shadow-line. Under normal conditions, optimal contrast is obtained by holding the instrument underneath and perpendicular to a light source. (florescent light is not recommended) - Once a reading has been taken, wipe dry with a clean cloth (do not wash or rinse) and place the instrument in the supplied plastic case. Store the instrument in a safe, dry environment.
Temperature is the single most important factor influencing refractometer readings and is one of the largest sources of measurement error. However, this device incorporates automatic temperature compensation (ATC) and the concern for temperature fluctuations in sample liquids is alleviated. When ambient temperature varies from 68 F (20 C), readings are automatically adjusted to compensate for temperature variance between 50 F to 86 F (10 C to 30 C).
