Product Description 1.Larger LCD display with backlight. 2.Relative time clock on MAX MIN and AVG provides a time reference for measurement. 3.Pressure, velocity or air flow measurement provides Zero Adjust. 4.Display pressure, Air velocity or air flow plus environment 5.Temperature simultaneously. 6.Easy to calculate the area of a rectangular or circular duct. 7.USB interface, USB to UART Bridge Controller.. 8.Low battery indication, and Auto Power Off mode (Sleep mode) increases.     Specifications: Manometer Accuracy ±0.3%FSO (25°C) Repeatability ±0.2% (Max.±0.5% FSO) Linearity/Hysteresis ±0.29% FSO Pressure Range ±5000Pa Maximum Pressure 10psi Response Time 0.5 Seconds typical Over range Indicator OL Under range Indicator -OL   Units Range Resolution PSI 0.7252 0.0001 mbar 50.00 0.01 inH2O 20.07 0.01 mmH2O 509.8 0.1 Pa 5000 1 Air...