Peak flow meter. Man using a peak flow meter (spirometer) to measure his respiratory output,and therefore the strength of his lungs,while wearing a nose clip | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Marazzi, Dr. P. |
Taille de l’image : | 5124 px × 3410 px |
Model Release : | Disponible |
Restrictions : | - |