1.Smart pressure sensor 2.four units of pressure, Bar, Kg/cm2 , Mpa, and PSI 3.LED display 4.No calibration needed Sensible Substance: Air, Liquid.Output: NPN, PNP 4~20mA, 0~10V.Power protection: Overload, Short-circuit, Reverse polarity.Protection classification: IP67.Certification: CE, RoHS EMA Pressure Sensor