Winters has released the PDT Differential Gauge Series, which measures pressure differences and notifies of pressure drops when they occur. Pressure drops may signify when filtration in pumps or other equipment need to be changed or serviced due to clogging. The PDT Differential Gauge Series is rated +/-1% ASME Grade 1A. The internal system is available in brass or stainless steel. The PDT Differential Gauge Series comes with a single aluminum micrometer pointer to show the pressure difference between two pressure sources. These pressure sources are measured by two independent but matched Bourdon tubes, housed within an aluminum case. Available dial sizes are 4.5in and 6in.