Any instrument used for measuring wavelengths of light spectra, optical or atomic emissions for the analysis of samples.

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Atomic absorption (AA) spectrometers use the absorption of light to measure the concentration of gas-phase atoms.
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Atomic emission and optical emission spectrometers determine analyte concentration via a quantitative measurement of the optical emission from excited atoms.
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Cuvette Holders (12 suppliers)

Cuvette holders are mounts that fix cuvettes in place while they are being used.
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ESR/EPR Spectrometers measure the spectrum produced by the magnetic energy level transitions of electrons having a net spin and orbital angular momentum. The spectrum obtained can be used to characterize the material being analyzed.
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ESR/EPR Tubes (3 suppliers)

ESR/EPR tubes hold samples in ESR or EPR spectrometers. They are thin glass walled tubes, uniformly thick, that produce low background noise.
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Fiber Optic Probes (34 suppliers)

Fiber optic probes collect light or spectra from extreme environments inside reaction vessels at high temperatures or pressures. Product types include UV-Vis spectroscopy probes, Raman spectroscopy probes, and refractometry probes.
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Flame Photometers (26 suppliers)

Flame photometers read atomic emissions to detect the presence of metal salts, principally sodium (Na), potassium (K), lithium (Li) and calcium (CA). 
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Fluorometers (105 suppliers)

Fluorometers measure the amount of fluorescent radiation produced by a sample exposed to monochromatic radiation.
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Infrared Spectrometers (173 suppliers)

Infrared (IR) spectrometers measure the wavelength and intensity of the absorption of infrared light by a sample.
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Mass Spectrometers (123 suppliers)

Mass spectrometers separate ions by their mass-to-charge (m/z) ratios. They are used to identify compounds by the mass of one or more elements in the compound. They are also used to determine the isotopic composition of one or more elements in a compound.
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NMR Probes (4 suppliers)

NMR probes incorporate radio frequency coils that are tuned for use in certain magnetic field strengths and detect specific nuclei. They can be switched out depending on the specific nuclei to be studied or the type of sample to be analyzed.
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NMR Spectrometers (16 suppliers)

NMR (Nuclear Magnetic Resonance) spectrometers are analytical devices that exploit the magnetic properties of certain atomic nuclei to determine physical and chemical properties of atoms or the molecules in which they are contained.
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NMR Tubes (5 suppliers)

NMR tubes hold samples in NMR spectrometers. They are thin glass walled tubes, uniformly thick and balanced for smooth spinning.
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Photometers (114 suppliers)

Photometers produce electrical signals, which correspond to radiant flux energy, for a series of discrete wavelength intervals. They are used to measure wavelengths of light spectra and optical or atomic emissions.
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Polarimeters (49 suppliers)

Polarimeters are scientific instruments used for measuring the rotation of the plane of polarized light as it passes through a sample of a compound which exhibits optical activity.
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Raman Spectrometers (85 suppliers)

Raman spectrometers are used to determine chemical compositions based on the measurement of the wavelength and intensity of inelastically scattered light from molecules.
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Refractometers (160 suppliers)

Refractometers measure the critical angle of refraction through a sample. The critical angle of refraction will change with concentration.
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Residual gas analyzers (RGAs) identify the gases present in vacuum environments.
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Spectroradiometers (17 suppliers)

Spectroradiometers are used to measure the spectral power distributions of light sources, monitors, and other illuminants.
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UV and visible spectrometers measure the amount of ultraviolet (UV) and visible light transmitted or absorbed by a sample placed in the spectrometer.
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Water quality photometers and colorimeters are ion-specific, computer-interfaced probes that are designed to determine the concentration of a solution from its color intensity.
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X-ray fluorescence spectrometers (XRFs) use a spectroscopic technique that is commonly used with solids, in which X-rays are used to excite a sample and generate secondary X-rays. 
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PCE Instruments / PCE Americas Inc.
Anton Paar
Konica Minolta Sensing Americas, Inc.