Lung Volume Kit, set of 4 used to measure vital capacity, the volume of air a person can expel after taking the deepest possible breath.

Technical Specifications :-

Comparisons can be made between a persons lung volumes and such factors as height, age, phusical activity and smokinh habits. The volume of air trapped in the bag is measured in litres and for all practical purposes represents a person`s lung volume, though a small portion of air always remains in the lungs.