Used a horizontal volume-displacement rolling seal spirometer. From Office Spirometry. A practical guide to the selection and use of spirometers. By PL Enright and RE Hyatt. Published by Lea and Febiger, 1987. Page 127.
Used a horizontal volume-displacement rolling seal spirometer. From Office Spirometry. A practical guide to the selection and use of spirometers. By PL Enright and RE Hyatt. Published by Lea and Febiger, 1987. Page 127.