The Dekati^® High Resolution ELPI^®+ (Electrical Low Pressure Impactor, HR-ELPI^®+) is an advanced version of the widely use ELPI^®+ instrument. The High Resolution ELPI^®+ combines features of the ELPI^®+ with a data inversion algorithm that gives real-time particle number size distribution in up to 500 size classes 6 nm – 10 μm. Other High Resolution ELPI^®+ features include wide particle sample concentration range, robust structure and possibility to characterize chemical composition of size classified particles after the real-time measurement. The wide measurement range, superior size resolution and fast time response make the High Resolution ELPI®+  and ideal tool for a broad range of particle measurement applications.