A polarimeter is a scientific instrument used to measure the optical rotation of polarized light as it passes through optically active substances, providing critical information about the compound's chiral properties and concentration. It consists of a light source, polarizing elements, a sample tube, and an analyzer. When polarized light enters the sample tube containing the substance under investigation, its plane of polarization rotates due to the optical activity of the compound. The analyzer measures this rotation angle, which is quantified in degrees. Polarimeter instrument are widely employed in chemistry, pharmaceuticals, and food industries for assessing the purity and concentration of chiral compounds, as well as in research applications to study molecular structure and interactions.