The present document is supplementary to the delivered demonstrator “D2.4 Advanced high-T Half-Mini DMA”, a technology developed in the frame of WP2 “Technology development”, Task 2.4 “Advanced DMA” of the SUREAL-23 project. The document aims to briefly present the Half-Mini Differential Mobility Analyzer instrument (hereafter referred to as the Advanced Half-Mini DMA), developed to be suitable for hot aerosol sampling in the context of sub-23 nm exhaust particle measurements. The document describes the new instrument, summarises its principle of operation and presents the main outcomes of preliminary testing and validation (performed by the technology developer, SEADM) as well as the evaluation of its operation with model and real exhaust aerosols (performed by APTL/CERTH).