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  1. O-RINGS , (see Fittings, Manifolds and Seals, Instrumentation)
  2. OCEANOGRAPHIC INSTRUMENTATION , (also see Meteorological Instrumentation)
  3. ODORANT SYSTEMS
  4. OHMMETERS , (see Electrical Measuring Instrumentation)
  5. OIL-IN-WATER MONITORS
  6. OPACITY INSTRUMENTATION , (also see Optical Instrumentation, Turbidity Instrumentation)
  7. OPERATOR INTERFACE STATIONS , (see Computers, Industrial, Workstations; Display Systems; Terminals)
  8. OPTICAL FIBERS , (see Cable and Accessories, Fiber Optic)
  9. OPTICAL INSTRUMENTATION , (see following; refer to variable of interest)
  10. OPTICAL INSTRUMENTATION, COLORIMETERS
  11. OPTICAL INSTRUMENTATION, INFRARED
  12. OPTICAL INSTRUMENTATION, LASERS
  13. OPTICAL INSTRUMENTATION, LIGHT SOURCES AND FILTERS
  14. OPTICAL INSTRUMENTATION, MAGNIFIERS AND MICROSCOPE
  15. OPTICAL INSTRUMENTATION, PHOTOCELLS
  16. OPTICAL INSTRUMENTATION, PHOTOMETERS
  17. OPTICAL INSTRUMENTATION, POLARIMETERS
  18. OPTICAL INSTRUMENTATION, POLARIZATION MODULATOR
  19. OPTICAL INSTRUMENTATION, REFRACTOMETERS
  20. OPTICAL INSTRUMENTATION, SPECTROMETERS
  21. OPTICAL INSTRUMENTATION, STANDARDS
  22. OPTICAL INSTRUMENTATION, STROBOSCOPES
  23. ORIFICE DEVICES (see Flowmeters)
  24. OSCILLATORS , (see Function Generators)
  25. OSCILLOGRAPHS , (see Recorders)
  26. OSCILLOSCOPES , (also see Display Systems)
  27. OSMOSIS INSTRUMENTATION
  28. OVENS , (see Chambers)
  29. OXYGEN ANALYZERS , (see Analyzers, Flue and Gas; Analyzers and Monitors, Water Quality)
  30. OZONE MONITORS