During a new particle formation (NPF) event, gas molecules cluster, stabilize, and grow into aerosol particles. To investigate its mechanisms, it is crucial to study NPF from the very beginning, when particles are only a few nanometers in size.\nThe Neutral Cluster and Air Ion Spectrometer (NAIS) is one instrument capable of measuring such small particles. This multichannel aerosol instrument measures charged particles and cluster ions of both polarities in the electric mobility range of 3.2 to 0.0013 cm²·V⁻¹·s⁻¹, as well as the distribution of aerosol particles in the size range from 2 to 40 nm.