Use these spirometer mouthpieces for sanitary use and with most spirometers.
Simply blow into the spirometer and read vital lung capacity measurement on the dial. The device is useful for comparing volumes between students and calculating average volume and variance, or for comparing volumes before and after exercise. It comes with 50 disposable mouthpiece tubes and instructions that include vital capacity charts.
Range: 0–7 L. Size: 2 1/2 in. dia. x 3 1/4 in.H.
Ordering information: Note: these spirometer mouthpieces are not compatible with the 9L Student Wet Spirometer (470007-990).