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The TSI Model 140 Quartz Crystal Microbalance (QCM) MOUDI Impactor that includes all of the following required specifications: 1) The precision research-grade impactor with real-time mass detection ba... The TSI Model 140 Quartz Crystal Microbalance (QCM) MOUDI Impactor that includes all of the following required specifications: 1) The precision research-grade impactor with real-time mass detection based on QCM sensors. 2) Providing excellent mass measurement accuracy thanks to the integrated humidity conditioning system that ensures reliable coupling of aerosol particles to the quartz crystal sensors. 3) With the QCM MOUDI impactor, setup and measurement time is about minutes allowing the user to collect size fractionated aerosol masses, in real time (1 Hz data collection), from tens of nanograms up to a few hundred micrograms. 4) The impactor has a 2.5-µm inlet and six QCM stages with sharp collection efficiency curves and calibrated cutpoints of 960, 510, 305, 156, 74 and 45 nm at 10 L/min inlet flow rate. 5) Advanced calibration capabilities.