The MFP Nano plus 4000 is specially designed for clear determination of the separation efficiency of HEPA and ULPA filter media in accordance with DIN EN 1822-3 and ISO 29463-3. In the form of the U-SMPS, a modern and powerful nano particle measuring device with a measurement range from 5 nm to 1 µm is used for particle size and quantity analysis: Measurement of the separation efficiency at a specific size is performed in real-time with the MFP Nano plus 4000 and a UF-CPC condensation particle counter in both the raw and clean gas.