[Maximum flow meters]

The use of maximum fluid measuring instruments is a simple technique which enables one to monitor the state of air passages in patients suffering from respiratory diseases, and from asthma in particular. The use of these instruments, although simple, requires a special technique in order to evaluate changes observed over a long period of time. Graphing the numerical values obtained through observation aids in the interpretation of these values. These measurements can become a useful factor in the diagnosis, classification and treatment of asthmatic patients. Proper maintenance of these instruments is of vital importance so that they function correctly. All of these factors come into play to contribute to making maximum fluid measuring instruments become "respiratory thermometers".