Pressure units optional: bar mbar kPa kgf/c㎡ mmHg cmH2O Ozf/in2 psi inHg inH2O ftH2O; Have data to maintain automatic shutdown using USB connect with computer by a specific software and other functions. Widely used in measuring the pressure of the fan and blower filter resistance wind speed furnace pressure orifice differential pressure water level of bubble and liquid amplifier or hydraulic system pressure etc. at the same time is also used for the air in the process of combustion gas ratio control and automatic control valve and the blood pressure and respiratory health care equipment pressure monitoring.