Abstract: The present invention pertains to a refractometer with a refractometer prism, on the measuring surface of which a sample to be analyzed can be placed, which can be illuminated by a light source in such an angle range that the critical angle of the total reflection is also contained in it, and with a receiver, on which the reflected radiation falls. The light source comprises a plurality of discrete light sources, which can be activated individually or together, and their radiation can be sent in one point to the refractometer in a bundled form.

Abstract: A refractometer with a measuring prism on whose measuring surface a sample to be tested can be mounted, which sample can be illuminated by a light beam emitted by a source of light under a range of angles that includes a critical angle for total reflection, and with a reciever for recieving the reflected light. An optical device that decomposes the reflected light into a color spectrum that is mounted in the path of the reflected light between the measuring surface and the reciever.

Abstract: The invention concerns a refractometer with a measuring prism on whose measuring surface a sample to be tested can be mounted, which sample can be illuminated by a light beam emitted by a source of light under a range of angles that includes the critical angle for total reflection, and with a receiver for receiving the reflected light, in which an optical device that decomposes the reflected light into a color spectrum is mounted in the path of the reflected light between the measuring surface and the receiver.