The ISE1 series is a compact, positive pressure switch available in a single setting with hysteresis adjustment, a double setting/double output type or an analog output type with hysteresis adjustment. The ISE1 is lightweight and the optional plug-in connector makes wiring easy and simple.This listing is for ONE (1) SMC ISE1-T1-55CL TISE1B30 Compact High Pressure Switch 0-1 MPa 1/8" NPTF.  Sold as 1-piece (each). Thanks for looking!!From the manufacturer:Model ISE1                                                           For high pressureRated pressure range/Set pressure range    0 to 1 MPaExpanded analog output range                      0.1 to 0 MPaProof pressure                                                1.5 MPaFluid                                                                Air/Non-corrosive, non-flammable gasPower supply voltage                                     12 to 24 VDC 10%, Ripple (P-P)10% or less (With power supply polarity protection)Current consumption                                      1 output: 17 mA or less at 24 VDC, 2 output:                                                              25 mA or less at 24 VDCResponse time                                                 5 ms or lessRepeatability                                                    1% F.S. or lessOperating Temperature Range                        Operating: 0 to 60C, Stored: 10 to 60C (With no condensation and no freezing)