Design for exercising and measurement of volume flow. Includes spirometer housing, detachable base plate, 12" segmented corrugated tubing with 22mm O.D. and mouthpiece. The flow passages vary in diameter, affecting the effort required to raise the ball, the ball stays suspended as long as the patient maintains this effort.

This listing is for quantity of Each, but we also offer it in quantity of Pkg of 20. The other quantity listing can be found in the "Related Items" below. Please contact us if you need help finding it in a different quantity listing.