The GRIMM SMPS+C systems feature the Vienna-type DMA design, well known for the highest size resolution and lowest particle diffusional losses – even for the smallest particles. GRIMM offers a flexible design of the Vienna-type DMA with two electrodes of different lengths to accommodate a variety of experimental needs. To expand the size range, the GRIMM SMPS+C can be combined with a GRIMM Optical Particle Counter to build a Wide Range Aerosol Spectrometer (WRAS) that measures size distributions up to the particle size of 32µm. It comes in two models - 5416-based and 5420-based.

The PSMPS is a mobility particle size spectrometer that combines a Grimm SMPS+C system with the Airmodus Particle Size Magnifier (PSM). This combination allows accessing the 1 nm particle size range. It is indispensable for understanding the basic mechanisms of the highly dynamic processes of particle formation and the growth rate of the particles (e. g. Kulmala et al., 2013, Direct Observations of Atmospheric Aerosol Nucleation. Science, 339, 934).

Particle nucleation processes are important in the atmosphere where they affect the formation of clouds and the radiative forcing but also in combustion-related studies (e. g. the emissions of vehicle engines) and in material sciences (e. g. the synthesis of nanoparticles).