FeNO testing device designed to make testing as simple as inhaling and exhaling using the breathing handle. Helps diagnose patients, optimise treatment, reduce exacerbations, uncover non-adherence to Inhaled Corticosteroids (ICS), all in one breath. As patients inhale through the breathing handle, ambient NO and excess humidity are removed from the breath, ensuring the exhalation reflects their true FeNO level. Flow Rate Control guides patients to easily perform a steady exhalation throughout the test, leading to accurate results. Sensors work from the first test to the last test and are accurate throughout their lifetime, no need to be returned for calibration or servicing. Two exhalation modes (6-second and 10-second). Suitable for FeNO testing, from children aged 4 to patients with sereverly reduced lung function. Three engaging animations with sounds guide patients to a successful test. Analyses the breath sample and displays the FeNO result as a single number in approx 1 minute.