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AS ISO 21501.1:2026 Determination of particle size distribution - Single particle light interaction methods Light scattering aerosol spectrometer
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AS ISO 21501.1:2026 identically adopts ISO 21501 1:2025, which specifies the characteristics of a light scattering aerosol spectrometer (LAS) which is used for measuring the size, number concentration and number-based size distribution of particles suspended in a gas