The Blue Chamber is a standard ultra high vacuum chamber with a base pressure of 5x10^-10 mbar. The chamber is equipped with an ion sputter gun for cleaning single crystals and an Auger electron spectrometer. A quadrupole mass spectrometer with a mass range of 1-100 amu is used for residual gas analysis and leak testing. The chamber has an automated cleaning and gas dosing system, developed for graphene growth. The system has also been used for in-situ investigations of surface gas reactions by STM.