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| Minimally resistant flow tubing | Reduce resistance to achieve the maximum volume in minimum time |
| Flow value imprinted on each chamber | Provides a visual incentive for the patient |
| Graduated 3 Ball Design | Encourages deep and prolonged inspiration |
| Compact design and break resistant plastic | Yields utility over time |
| Colorful Presentation | For precised visualization |
| Small-size design | Economical in maintenance and storage costs |