Sonmol Digital Peak Flow Meter Portable (SMPF-2S)

The Sonmol Digital Peak Flow Meter Portable (SMPF-2S) represents a significant advancement in personal respiratory health technology. As an FDA-cleared Class II medical device under 510(k) K203196, it is engineered to provide highly accurate measurements of both Peak Expiratory Flow (PEF) and Forced Expiratory Volume in one second (FEV1). Our technical evaluation focused on its pressure sensor modality, which offers a robust alternative to laboratory spirometry by accurately integrating flow rates to calculate volume metrics. The device is notably compact, weighing only 52g, and features an integrated segment LCD with a green backlight for immediate visibility of results. A key engineering distinction of the SMPF-2S is its automated risk indicator system, which categorizes measurements into Green, Yellow, or Red zones based on the user's personal best baseline. The integration of Bluetooth Low Energy allows for seamless synchronization with tracking applications, transforming the device from a simple meter into a comprehensive asthma management system that replaces traditional paper logging. Clinical data supports its high fidelity, with volume accuracy verified within ±3% or ±0.05L and flow rate accuracy within ±10% or ±18L/min, meeting the rigorous standards of the American Thoracic Society (ATS).