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The Telescope Encoder and Sky Sensor (TESS-W) is the first model of TESS photometers, compact devices to monitor sky brightness every night developed under Stars4All project.
TESS-W photometer sending data today
Designed by astronomers and calibrated on LICA laboratory at Universidad Complutense de Madrid the quality of the data is scientifically accurate.
“Absolute Radiometric Calibration of TESS-W and SQM Night Sky Brightness Sensors” Bará, Tapia & Zamorano (2019)