A refractometer is an optical instrument used to measure the refractive index of liquids, solids, or gases. It's commonly used in industries such as food & beverage, automotive, pharmaceuticals, and gemology.

• Principle: Based on Snell's Law – measures how light bends as it passes through a sample.
• Applications: Sugar content (Brix), coolant concentration, salinity, gem identification.
• Types: Handheld analog, digital, Abbe, inline process.
• Key Components: Prism, lens, eyepiece or sensor, light source, calibration mechanism.

Note: Calibrate with distilled water or standard solution before use.

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