The Spirohome Personal ultrasonic spirometer allows a patient to perform spirometry tests in a home-setting. The device is used with a reusable mouthpiece, and is intended to be used by only one user. The user interface for the device is the Spirohome Personal application. The Spirohome Clinic ultrasonic spirometer is used for spirometry testing in healthcare settings such as clinics and hospitals. One Spirohome Clinic device may be used by multiple patients. A new disposable mouthpiece is used for each user of the device. The user interface of the device is the Spirohome Clinic application. For more information about each product, please refer to the device user manual.