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Polarimeter passes polarized light through an optically active substance to measure the angle of rotation. This polarized light will rotate either clockwise or anti-clockwise when it passes through chemical substances that are optically active. This amount of light rotating is known as angle of rotation. If the light rotates to left (anti-clockwise) it is a levo-isomer, and if it rotate to right (clockwise) it is a dextro-isomer. A few different types of Polarimeters include:
  1. Laurent's Half-Shade Polarimeter
  2. Biquartz Polarimeter
  3. Lippich Polarimeter
  4. Manual Polarimeter
  5. Fully Automatic Polarimeter

Each polarimeter is used according to its usages in different industries.