The Dekati® High Resolution ELPI®+ (HR-ELPI®+) is a completely new version of the widely used ELPI®+ instrument. The High Resolution ELPI®+ combines features of the ELPI®+ with data inversion algorithm that gives real-time particle number size distribution in up to 500 size classes 6 nm – 10 µm. This makes the High Resolution ELPI®+ a superior tool for detailed particle size distribution analysis in a broad size range that otherwise would need to be covered with two separate instruments.