измерение размеров отверстий на ступенях импактора(Compendial reference methods call for periodic measurement of the size of the nozzles on each stage, a procedure known as stage mensuration...the effective diameter provides an intuitive and technically sound basis for setting acceptance criteria for new and in-use impactors.(Journal of Aerosol MedicineVol. 18, No. 4) ProtoMolecule)
