AEM 7 BAR MAP or 100 PSIA Stainless Steel Sensor Kit DIN 810:1986 DE Werkzeugmaschinen; Pressen; Stelbohrungen fr. There are many different tools that can be used for measurement, but the degree of accuracy is dependent upon the tool. For example, a ruler can measure distance with a good degree of accuracy, but for a more precise measurement a caliper should be used. The difference between a brass pressure sensor and a stainless steel pressure sensor is similar if we think about it in these terms: