Neulog's spirometer sensor enables measuring the volume of our lungs. The sensor includes a tube and it measures the air flow that passes through it. The volume (in liters) is calculated by the software area calculation function. The tube has a narrow part in its center and it calculates the flow rate by measuring the pressure difference between the two ports of the tube. Additional accessories, such as USB, Wi-Fi, or battery modules, are required for operation depending on the device (PC, tablet, viewer) used to receive readings from the sensor. (Accessories and devices sold separately.)