Inquiry (采购产品): Calibration My ouestion is what type of machine do you need to cal a Differntial Pressure Gauge Switch. The gauge is in stalled in a hallen strainer that is use for shaft seal flow. **** Hidden Message ***** Glen Stewart 09581 Company: US Navy E-mail: gstewart@shreveport.navy.mil **** Hidden Message ***** gstewart@shreveport.navy.mil