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  4. Furnishings and Equipment (hierarchy name)
  5. Measuring Devices (hierarchy name)
  6. measuring devices (instruments)
  7. [measuring devices for extent]
  8. quantity measuring devices
  9. [quantity measuring devices for substances]
  10. opacimeters
Scope note
Photoelectric instruments used for measuring the amount of sediment in liquids; often used in the process of papermaking, to gauge opacity.
Accepted term: 27-May-2024