Congratulations on your purchase of the Extech RF10 or RF15 Brix Refractometer. These precision optical instruments should be handled gently and the optical surface should be avoided from touching. Careful use of these instruments will provide years of reliable service. The refractive index of a sample is measured and displayed in % Brix. The instrument has a range of 0 to 32% Brix with a resolution of 0.2%. The dimensions and weight vary for each model. The instrument requires zero adjustment and cleaning of the prism before use. To take a sample reading, a few drops of the sample liquid are placed on the measurement prism and the liquid is spread across the entire surface without air bubbles or dry spots. The sample remains on the prism for approximately 30 seconds and the sucrose concentration is determined by the intersection of the light/dark boundary observed through the eyepiece.
This document is the User's Guide for the Extech RF10 and RF15 Brix Refractometers, precision optical instruments used to measure the refractive index of samples and display results in % Brix. The guide provides instructions on handling the device, preparing samples, and taking accurate readings.
| Range | 0 to 32% Brix |
|---|---|
| Resolution | 0.2% |
| Dimensions (RF10) | 6.6 x 1.3 x 1.3" (168 x 32 x 32mm) |
| Dimensions (RF15) | 6.3 x 1.4 x 1.4" (159 x 35 x 35mm) |
| Weight (RF10) | 3.2 oz. (91g) |
| Weight (RF15) | 7 oz. (200g) |
Cover the prism with distilled water, close the cover plate, and rotate the adjustment screw until the light/dark boundary lines up with the zero line.
The RF10 Refractometer has been designed for use with a 20°C standard temperature.
The RF15 makes temperature correction automatically when ambient temperature strays from 68°F (20°C), adjusting readings between 50°F to 86°F (10°C to 30°C).