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Recorders, digital
Recorders, line, industrial
Recorders, drum, industrial
Recorders, pen
Recorders, wire
Recorders, strip chart
Recorders, circular chart
Recorders, chart, paperless
Recorders, punched tape, industrial
Data recorders, mechanical, industrial
Recorders, heat sensitive paper, industrial
Recorders, electrostatic, industrial
Recorders, point, industrial
Recorders, X-Y, industrial
Recorders, multiple indication, multichannel
Recorders, on-off, events and machine operations
Recorders, miniature
Recorders, portable
Recorders, cathode tube, industrial
Recorders, galvanometric
Recorders, transient
Recorders, ultraviolet (UV) light beam
Recorders, potentiometric
Recorders, instrumentation, multichannel, magnetic tape or film
Pens and writing systems, chart recorder
Photoelectric cells
Streakscopes (streak cameras)
Spectrometers, optical
Spectrometers, grating
Spectrometers, nuclear magnetic resonance (NMR)
Spectrometers, fluid analysing
Spectrometers, sound
Spectrometers, photon correlation
Spectroradiometers
Spectrophotometers, ultraviolet (UV)
Spectrophotometers, infrared
Spectrophotometers, visual
Spectrophotometers, flame
Spectrophotometers, atomic absorption
Spectrophotometers, nuclear magnetic resonance (NMR)
Spectrophotometers, scanning, computer aided for colour systems
Spectrographs, X-ray diffraction and X-ray diffractometers
Spectroscopes
Spectroscopes, pocket
Spectrographs, quartz
Spectrographs, glass
Spectrographs, grating
Spectrographs, infrared
Spectrographs, Littrow
Spectrographs, Raman
Spectrographs, comparison
Spectrographs, direct reading
Analysers, spectrographic emission
Spectrohelioscopes and spectroheliographs
Luminance meters
Multiplexers, optical
Lux-meters
Luminescence meters
Glossimeters
Autocollimators
Collimators, optical
Polarimeters, polariscopes and spectropolarimeters
Radiometers
Monochromators
Bolometers
Telespectroradiometers
Interferometers and interferoscopes
Scatterometers, optical research
