Discount Cardiology is one of the few remaining companies with a stock of Renaissance II Spirometers. Discount Cardiology is one of the largest distributors of Spirometers, computer and PC based Spirometers, Portable Spirometers, Welch Allyn Spirometers, Micro Spirometers, diagnostic spirometers and spirometers for spot checking. A spirometer is an apparatus for measuring the volume of air inspired and expired by the lungs. It is a precision differential pressure transducer for the measurements of respiration flow rates. The spirometer records the amount of air and the rate of air that is breathed in and out over a specified period. Spirometry is also known as a pulmonary function test pr PFT.<< less