“I certify that our group, CABE until 2008 and Analytical and Environmental Chemistry since then, of the University of Geneva-Switzerland is a user of the Idronaut Ocean Seven multiparameter probes since the last 25 years. These probes, and in particular the models 304 and 316Plus, were successfully applied for in situ monitoring in both sea and fresh- waters as part of our national and international research activities as well as teaching activities. We are fully satisfied by the performance of these instruments; their ease of use, sensor reliability and roughness; and by the efficient support provided by the Idronaut Company. Therefore, I can recommend these instruments to any institutes involved in environmental monitoring.”