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Peak flow meter isolated on wooden background. Hand medical device used to monitor the breath of a person suffering from bronchial asthma. Peak flow meter wide range of values. Breath test allergy. Lung function testing

Asthma medical device. Medical equipment. Breathing measure experiment. Asthma breathe test. Pulmonary test. Lung testing. Spirometry. Respiratory test. Testing breathing. Heathcare technology. Lung capacity. Blowing breathe. Chronic asthma treatment