For twenty years now Hiden Analytical has been a global leader in the design and manufacture of scientific instruments for research, development and production applications. In vacuum, gas analysis, surface and plasma processes, our quadrupole mass spectrometers have gained world wide recognition for their precision and outstanding performance. Our range of gravimetric analysers offers state of the art solutions in the measurement of moisture sorption characteristics of materials and in gas-solid interactions. Complementing our analytical instruments, the Proteus multistream valve provides unrivalled performance in process and environmental gas sampling.