Planktoscopes, low-cost, high-throughput monitoring devices for the semi-automatic analysis of phytoplankton have been acquired for the INDIFUN-AI project and will be used to analyse existing, archived phytoplankton samples. The instruments will undergo a series of quality assurance tests such as a comparison of the effects of different fixation methods on the analysis results. The final goal will be to establis protocols for the routine use of this device in a monitoring context