Mouthpiece, Disposable, For a more sterile environment, use the cardboard mouthpieces to help eliminate the spreading of contagious material between students
Baseline* Windmill Type Spirometer, Compact, lightweight spirometer for screening large populations, Indicator registers forced vital lung capacity up to 7 liters, Comes with 50 plastic mouth pieces, Dimensions: 3.5 X 3 X 3.5 in, Weight: 2 lbs