The HPEA/LPA2 is the second generation liquid-phase adapter for the Handy PEA chlorophyll fluorescence measuring system. It has been designed to simply connect to the Handy PEA control unit as a direct replacement for the standard sensor head. It provides measurements of the fast fluorescence kinetics from samples such as suspensions of chloroplasts or algae and any other photosynthetically active suspension. The curves are recorded by the Handy PEA control unit at acquisition rates of up to 100kHz. The key fluorescence parameters measured are displayed on the LCD display of the Handy PEA control unit before being saved to memory. Recorded traces may then transferred to the PEA Plus software for further analysis.