This Dataset consists of the measurement Data of the first measurement campaign of the Falling Film Evaporation Test Rig (FETRIG) at ITLR. Within this measurement campaign the local film thickness of a falling water film was measured using a confocal chromatic imaging (CCI)-sensor for different liquid Reynolds numbers as well as different gas Reynolds numbers of a counter current gas flow. For this purpose, a Keyence CL-030P was used with a temporal resoluion of 5000Hz. Additionall, macroscpoic flow patterns of the falling liquid film were captured with a high speed camera, namely a Krontec Chronos RGB 1.4 utilizing a framerate of 500 fps. For the investigations of the gas flow, a hot wire anemometer, provided by SVMtec, was used to measure the gas velocity profiles without falling film flow. (2025-04-15)