Hi Alex: A week ago I wanted to see what my house water pressure was and so looked f= or a low cost water pressure sensor, but no luck. After spending some time in the auto parts store finally got an oil pressur= e sender that was for an analog gauge rather=20 than just a switch. I turns out to be calibrated (using a patented method) at 1 Ohm per PSI. T= his works well with the Fluke 87 DMM in=20 Min-Max mode. See: http://www.prc68.com/I/WaterPressure.html http://www.prc68.com/I/DMM.shtml --=20 Have Fun, Brooke Clarke http://www.PRC68.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .