Digital Spirometer

Take the guesswork out of who's the biggest windbag.  Our Digital Spirometer duplicates the performance of professional instruments by quickly and accurately measuring lung volume - a nice addition to physiology, anatomy, and health classes.  The large digital display gives instant volume readouts - no more lengthy calculations.  Use with the included AC adaptor or with 2AA batteries for the field.  We also include 50 disposable mouth pieces.