The 849 Illuminated Console or Panel Series Duplex Air Gauges are designed with high quality bronze bourdon tubes and precision phosphor bronze movement for optimum performance and reliability. Black, green, white, silver dials and an assortment of scales, i.e. PSI (0-160 and 0-200 models), BAR, Kg/Cm2, Kilo Pascal, etc. are available to measure a variety of air pressures, i.e. MR, BP, BC and MRE. Air connections are on the back of the gauge case assembly. An integral test feature makes it easy to install within your console and inspect in place without breaking any air and/or electrical connections while using the GW 706-000 Gauge and Pressure Switch Tester. The gauge and cover assemblies are made of molded, break resistant, polycarbonate.