The Telescope Encoder and Sky Sensor (TESS-W) is the first model of TESS photometers, compact devices to monitor sky brightness every night.
Designed by astronomers and calibrated on LICA laboratory at Universidad Complutense de Madrid the quality of the data is scientifically accurate.
This app is intended to be a ligth acces to the stars4all project ( https://stars4all.eu ) photometers data database.