A Respirometer is a medical apparatus or a device which is used to measure the volume of air that is inhaled and exhaled by the lungs. This device helps the lungs to retrain and also assists in how to take slower and deeper breathes which could be difficult for someone who has undergone surgery or a COPD exacerbation and may find it painful to breathe on his own. The Respirometer is made up of a plastic base plate with three transparent chambers with designated volume and each chamber consists of a coloured ball or a sphere. The central part is attached to a tube with a mouthpiece which has an integrated filter. The balls rise uniformly when the user inhales.