Estia Consulting & Engineering SA owns a cup anemometer calibration laboratory. The laboratory is accredited according to ISO17025:2005. It is fully equipped and performs calibrations for all types of cup anemometers. The calibrations are conducted in the closed test section wind tunnel which has been constructed by the company. The calibration speed ranges between 4m/s and 16m/s. The reference air speed is measured using Pitot tubes, resulting in high accuracy and low uncertainty of the results. The calibration and return of the instruments to their owner is typically completed in 2-3 days from their delivery day.