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Large-volume measurement and advanced low-work-of-breathing filter. Contains gradations on both sides of unit, and good/better/best flow window for visualization of display improvement. Large volume measurement up to 4000mL inspired air. Good - Better - Best flow-window. Compact, ergonomic design. Advanced, low work-of-breathing filter design. Built-in handle. Voldyne Volumetric Exerciser 4000 mL
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