1) Optical device 2) Optical device 3) Polariscope 1) Polariscope 
A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically active substance. Some chemical substances are optically active, and polarized (unidirectional) light will rotate either to the left (counter-clockwise) or right (clockwise) when passed through these substances. The...
instrument for measuring polarised light
• (n.) An instrument for determining the amount of polarization of light, or the proportion of polarized light, in a partially polarized ray.
An optical instrument that measures the direction and extent of the polarization of light reflected from its targets.
A device used to measure optical activity.
An instrument for measuring the state of polarization of a beam of light or other form of electromagnetic radiation.
A device used to measure optical activity.
(po″lә-rim´ә-tәr) a device for measuring the rotation of plane polarized light.
Po`lar·im'e·ter noun [ Polar + -meter .] (Opt.) An instrument for determining the amount of polarization of light, or the proportion of polarized light, in a partially polarized ray. 
Type: Term Pronunciation: pō′lăr-im′ĕ-tĕr Definitions: 1. An instrument for measuring the angle of rotation in polarization or the amount of polarized light.
[n] - an optical device used to measure the rotation of the plane of vibration of polarized light
This is used to measure the optical activity or the rotation value of a solution. The instrument is usually made up of two prisms. A frequently used type is the penumbral polarimeter according to Lippich. With residual sweet wines, it is used to measure the ratio of glucose (grape sugar) and fructose (fruit sugar).
polariscope noun an optical device used to measure the rotation of the plane of vibration of polarized light