RT Report T1 Calibration of SQM-L photometers for the NixNox project A1 Zamorano Calvo, Jaime A1 Muñoz Marín, Víctor Manuel AB Twelve SQM-L night sky photometers have been tested and analyzed to determine their internal precision and differences in response. These photometers will be used by amateur astronomers around Spain, under the supervision of the Sociedad Española de Astronomía (SEA), to locate and characterize sites with dark skies well suited to perform astronomical observations (NixNox Project). A simple experimental setup has been built to obtain zero offsets for each photometer in order to correct all the observations. YR 2010 FD 2010-11-11 LK https://hdl.handle.net/20.500.14352/48966 UL https://hdl.handle.net/20.500.14352/48966 LA eng NO This work is part of the trainee project of Víctor Manuel Muñoz as student of the International School for Advanced Instrumentation (IScAI) DS Docta Complutense RD 10 abr 2025