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.