This report documents the delivered demonstrator “D2.2 Tunable UV photoelectric setup”, a prototype instrument developed in the frame of WP2 “Technology development”, Task 2.2 “Tunable UV laser photoelectric charger composition-specific aerosol charging” of the SUREAL-23 project. It describes the current state of the art, the innovation and the principle of operation of the developed setup and it presents some preliminary results performed with an aerosol generated by a propane diffusion flame. This prototype will continue to undergo improvements and will be available for sub-23 nm combustion aerosol characterisation in the SUREAL-23 project.