How can I adjust the refractometer?
The refractometer is properly adjusted when delivered. One must nevertheless regularly check the refractometer. It can, in particular, become maladjusted after a shock. If the refractometer has a beginning value of 0% Brix, it can be adjusted with distilled water. The measured temperature (especially the device temperature) should be 20 °C. The boundary line must therefore be set to 0% Brix. If the result read is not 0, the boundary line must be set by turning the adjustment screw to 0% Brix.
For medical refractometers and for Item no. 2350, the value must be adjusted to 1.3330 nD, because pure water at 20 °C has this refractive index.
In order to adjust refractometers which do not have a starting value of 0% Brix, we can provide a test liquid (Item RH9000) with a defined Brix or nD value (additional cost). This liquid is measured with the refractometer. For this, the refractometer must have a measurement temperature of about 20 °C. If the refractometer does not show the target value, the boundary line must be re-set with a screwdriver to the displayed target value. The test liquid is removed with soft paper and alcohol or rinse liquid/soap from the prism and from under the prism cap (water alone is insufficient).