The Extech RF18 Brix Refractometer is a precision optical instrument that measures the refractive index of a sample, displayed as % Brix. It requires zero adjustment before use and the prism should be cleaned with a soft cloth. The sucrose concentration is determined by observing the boundary of the light and dark fields on the scale.
This document is the User's Guide for the Extech RF18 Brix Refractometer, a precision optical instrument used to measure the refractive index of a sample and display the result in % Brix. The guide provides instructions on handling the device gently to ensure reliable service.
The manual details the operational procedures, including how to perform a zero adjustment using distilled water and how to prepare samples for reading. It also explains the importance of temperature compensation, providing a table to manually correct readings if the sample temperature deviates from the standard 20°C.
| Range | 0 to 18% Brix |
|---|---|
| Resolution | 0.1% |
| Dimensions | 1.2 x 1.6 x 6.7" (30 x 40 x 170mm) |
| Weight | 3.2 oz. (91g) |
The RF18 Refractometer has been designed for use with a 20°C standard temperature.
If the temperature of the samples fluctuates, you should zero the refractometer every 30 minutes.
Extech warrants the instrument to be free of defects in parts and workmanship for one year from the date of shipment.