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Hach Company manufactures and distributes analytical instruments and reagents used to test the quality of water and other liquid solutions. Manufactured and distributed worldwide, Hach systems are designed to simplify analysis by offering on-line instrumentation, portable laboratory equipment, prepared reagents, easy-to-follow methods, and technical support.
A more popular term for this instrument in water quality testing is a turbidimeter. However, there can be differences between models of turbidimeters, depending upon the arrangement of the source beam and the detector. A nephelometric turbidimeter always monitors light reflected off the particles and not attenuation due to
Turbidimetry (the name being derived from turbidity) is the process of measuring the loss of intensity of transmitted light due to the scattering effect of particles suspended in it.
Turbid creek water caused by heavy rains. The measurement of turbidity is a key test of both water clarity and water quality. [citation needed] There are two standard units for reporting turbidity: Formazin Nephelometric Units (FNU) from ISO 7027 and Nephelometric Turbidity Units (NTU) from USEPA Method 180.1.
Spectrophotometer for OD600 and Cell Density Measurements. OD600 (Also written as O.D. 600, D 600, o.d. 600, OD 600) is an abbreviation indicating the optical density of a sample measured at a wavelength of 600 nm in 1 cm light path (unless otherwise stated).
Different kinds of Secchi disks. A marine style on the left and the freshwater version on the right. The Secchi depth is reached when the reflectance equals the intensity of light backscattered from the water. 1.7 divided into this depth in metres yields an attenuation coefficient (also called an extinction coefficient), for the available light averaged over the Secchi disk depth.
Visualisation of the ocean turbidity of the ocean just before Hurricane Bob (August 14, 1991). Ocean turbidity is a measure of the amount of cloudiness or haziness in sea water caused by individual particles that are too small to be seen without magnification.
Video calibration software is software used to improve the quality of commercial video reproduction.. Organizations such as the Society for Motion Picture and Television Engineers (SMPTE), the Commission Internationale de l'Eclairage, the Advanced Television Systems Committee (ATSC), and the International Telecommunication Union (ITU) have established standards for the proper transmission and ...
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