The Vmax Autobox V62W system combines pressure-compensated flow technology and spacious 1350 L cabin design that helps test larger and wheel-chaired subjects, or comfortably accommodate adult with a small child. The rotating arm allows testing outside the cabin as well. This complete pulmonary function testing system allows measurement of lung volumes (by body plethysmography and/or nitrogen washout), lung diffusion capacity, lung compliance, airway resistance (by body plethysmography and/or impulse oscillometry), maximal inspiratory and expiratory pressure and maximal voluntary ventilation.