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All QRS spirometers use pre-calibrated, disposable mouthpieces. These mouthpieces are individually calibrated during production using the same equipment LDS Hospital uses to validate spirometers against the American Thoracic Society's Recommendations for the Standardization of Spirometry.
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⚠️ WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, visit Proposition 65