Features: Advanced, low work-of-breathing filter design Compact, ergonomic design Good - Better - Best flow window Large volume measurement up to 5000ml Product Overview: Voldyne 5000 Volumetric Exerciser This incentive spirometer is an important tool for a patient's lung health. The large volume measurement and advanced low-work-of-breathing encourage deep breathing up to 5000 ml. The good/better/best flow window provides visualization of daily improvement. Compact, ergonomic design with built-in handle. Gradations on both sides of the unit. Single-patient use.