This app works with the SPM-100 Static Pressure meter. The SPM-100 manometer is available through HVAC wholesale distributors worldwide. To find a local distributor please visit our website at www.aabsmart.com. The SPM-100 dual port manometer accurately measures Static Pressure, Pressure Differential, Indoor vs. Outdoor Pressure, and System Total External Static Pressure. It provides both standard and metric measurements and automatically imports local weather data to calibrate and improve the accuracy of readings.