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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
How to Use Refractometers. A Refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry). There are four main types of refractometers: traditional handheld refractometers, digital handheld, laboratory or Abbe refractometers and in-line process refractometers.