All types of measurement and analysing instruments are composed of various instrument parts and accessories. Examples of these measurement and analysing instruments also include universal measuring machine, time-domain reflectometer, SWR meter, spectroscope, sensor, S meter, postage meter, parking meter, gradiometer, gauge, force platform measures, densitometer, and check weighed. Having numerous instrument parts and accessories, measurement and analysing instruments like radio antenna and telescope are used in astronomy. For medical imaging, instruments like tomograph, computed tomography, medical ultrasonography and magnetic resonance imaging etc. are frequently used for exclusive and specific measurement purposes. Luminance or photometry is measuerd by light meter, densitometer, lux meter and photometer while substance identification is done by using different measures such as ultracentrifuge, smoke detector, refractometer, oxygen sensor, nephelometer (also called turbidimeter), mass spectrometer, gas detector, colorimeter, chromatographic device and carbon dioxide sensor etc. Any particle is measured by various advanced measurement instruments such as semiconductor detector, scintillation counter, photostimulable phosphors, photographic plate, microchannel plate detector, geiger counter, dosimeter, and cloud chamber and bubble chamber etc. Light and radiation is measured by antenna, microwave power meter, bolometer, interferometer, radio telescope, camera, T-ray detectors, EMF meter, photographic plate, spectrometer, photomultiplier, and phototube etc. These all measurement tools and instruments are composed of multiple instrument parts and accessories.
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