The Dekati^® High Temperature ELPI^®+ (Electrical Low Pressure Impactor, HT-ELPI^®+) is a unique version of the Dekati^® ELPI^®+ that enables real-time measurement of particle size distribution from 6 nm up to 10 μm with 10 Hz sampling rate. The High Temperature ELPI^®+ allows direct measurement of up to 180 °C high temperature aerosol samples without the need to cool the sample, which makes the HT-ELPI^®+ a one of a kind tool to characterize high temperature aerosols. Additionally, the HT-ELPI^®+ has all the benefits of the Dekati^® ELPI^®+ system including real-time standalone operation, wide sample concentration range, wide particle size range and robust structure for operation even in harsh conditions. The use of impactor technology enables post-measurement chemical analysis of the size classified particles. In addition, the HT-ELPI^®+ can be used for real-time particle charge distribution and gravimetric measurements. All these features make the HT-ELPI^®+ an ideal choice for characterization of high temperature aerosols.