If your doctor wants to use an incentive spirometer to strengthen your breathing muscles, ... An analog spirometer features moving parts that change position when you breathe into the device.

If your doctor wants to use an incentive spirometer to strengthen your breathing muscles, ... An analog spirometer features moving parts that change position when you breathe into the device.

Incentive Spirometer: This simple gadget helps you exercise your lungs so you can breathe deeply if you’ve had surgery or have a medical condition.