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  • Measuring instruments designed to count solid particles in the environment. These counters are typically electronic instruments with appropriate sensors that can measure several sizes (e.g., 0.3, 0.5, 1.0, and 5.0 microns) of particles simultaneously and display the results typically in number of particles per unit of volume (e.g., particles/cubic foot, particles/liter). Environmental particle counters may be used for particulate monitoring in clean rooms, research laboratories, and clinical pharmacies, but they have their primary use in pharmaceutical, medical device, and semiconductor industries.
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