MiniBox+ is a patented, first-of-its-kind, desktop plethysmography device for complete Pulmonary Function Testing (PFT) in any clinical setting. It is easy to use and provides accurate and repeatable, fully automatic measurements of Total Lung Capacity (TLC) and Residual Volume (RV), as well as Spirometry and Single Breath CO Diffusion (DLCO). With as little as 60 seconds of tidal breathing required for Lung Volume Measurements, this gasless, cabinless system provides maximum patient comfort and reduced anxiety.