Quick answer

A refractometer measures how much a ray of light bends as it passes through a liquid; dissolved substances change the liquid's density and make light bend more sharply. It does not identify the molecules. The main types are analogue handheld, digital handheld with an LCD screen, Abbe benchtop for laboratories, and inline models mounted in factory pipelines.

REFRACTOMETER

When a substance is dissolved in water, the liquid's molecular density changes, causing light to travel slower and bend more sharply. “The refractometer measures how much the light ray bends, but it does not identify the molecules that caused that deviation.”, as noted by

Main Types of Refractometers

  • Traditional Handheld (Analog): Uses ambient light and an eyepiece to view a shadow line on an internal scale.
  • Digital Handheld: Features an internal light source and an LCD screen to instantly display numeric results.
  • Abbe / Benchtop: High-precision laboratory devices used for wide measurement ranges and advanced chemical analysis.
  • Inline / Process: Mounted directly inside factory pipelines to monitor fluid concentrations in real-time. 

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