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O-Rings
(see Fittings, Manifolds and Seals, Instrumentation)
Oceanographic Instrumentation
(see Meteorological Instrumentation)
Odorant Systems
Ohmmeters
(see Electrical Measuring Instrumentation)
Opacity Instrumentation
(see Optical Instrumentation; Turbidity
Instrumentation)
Operator Interface Stations
(see Computers, Industrial, Workstations; Display
Systems; Terminals)
Optical Fibers
(see Cable and Accessories, Fiber Optic)
Optical Instrumentation
(see following; see variable of interest)
Optical Instrumentation, Colorimeters
Optical Instrumentation, Infrared
Optical Instrumentation, Lasers
Optical Instrumentation, Light Sources and Filters
Optical Instrumentation, Magnifiers and Microscope
Optical Instrumentation, Photocells
Optical Instrumentation, Photometers
Optical Instrumentation, Polarimeters
Optical Instrumentation, Polarization Modulator
Optical Instrumentation, Refractometers
Optical Instrumentation, Spectrometers
Optical Instrumentation, Standards
Optical Instrumentation, Stroboscopes
Orifice Devices
(see Flowmeters)
Oscillators
(see Function Generators)
Oscillographs
(see Recorders)
Oscilloscopes
(see Display Systems)
Osmosis Instrumentation
Ovens
(see Chambers)
Oxygen Analyzers
(see Analyzers, Flue and Gas; Analyzers and
Monitors, Water Quality)
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