Overview Reviews Product Description Compact, lightweight spirometer for screening large populations. Subject blows into disposable mouthpiece. Indicator registers forced vital lung capacity up to 7 liters. Comes with 50 plastic mouth pieces. Product Videos Custom Field Product Reviews Write a Review Write a Review × Baseline Baseline Windmill Type Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *