A rolling seal spirometer. Came with or without a built-in chart drive. Manufactured and sold by Sensormedics/Thermo Respiratory Group. Photo obtained from a sales brochure found at Velozi.com.
A rolling seal spirometer. Came with or without a built-in chart drive. Manufactured and sold by Sensormedics/Thermo Respiratory Group. Photo obtained from a sales brochure found at Velozi.com.