… Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring …
Explanatory notes
… 90.27 ‑ Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, … of a ray of light is rotated in passing through an optically active substance. They consist essentially of a … of light, an optical device comprising polarising and analysing prisms, a tube holder in which the substance to be …