【Wide Pressure Range】: The selectable pressure range of this manometer is ±30psi/±200kpa, with an accuracy of ±0.3%FSO (at 25°C), repeatability of ±0.25% (Max ±0.5%FSO), and linearity/hysteresis of ±0.1%FSO. 【Accurate Measurement】: The ultra-low-power sensing and measurement with 32-bit MCU and 24-bit ADC make the air pressure measurement faster and more accurate. It's perfect for working on tankless heaters, electric valves, and domestic boilers. It can also measure air flow about your bathroom fan, among other uses. 【Multiple Units of Measure】: This manometer offers 11 selectable units of measure,including kPa, Psi, Kgfcm2, Ozin2, Bar, mbar, inHg, mmHg, InH2O, FtH2O, cmH2O. It also features a data hold function and error code response time of 0.5 seconds. 【Dual Tube Connectors】:Comes.