All instruments depart Pulsar Instruments professionally calibrated and they are equipped with a legitimate calibration certificate to international standards. Pulsar may also source your meters as UKAS calibrated which is the highest level of calibration you can get (added expenses submit an application for this). For that reason, Course 1 https://dallaszbzyw.bloguerosa.com/31541891/the-smart-trick-of-noise-level-measurement-instrument-that-no-one-is-discussing