The Mini Submersible Pressure Gauge luminescent dial reads from 0 to 350 BAR | 5000 PSI. For at-a-glance monitoring of air pressure the instruments face is divided into three different colored zones: the area from 50 BAR | 600 PSI and below is highlighted in red with a solid BAR and red stripes. If the gauge is used on deeper dives, the red scale extends and fades to 100 BAR | 1300 PSI, this provides for added reserve air indication required at greater depths. From 50 BAR | 600 PSI to approximately 200 BAR | 3000 PSI the scale is green and from 200 BAR | 3000 PSI to end of scale is colored in blue. The front glass lens is made to act as a pressure relief valve. In the event of a sudden increase in pressure inside the instrument, the glass rises slightly, allowing the excess pressure to escape. The Instrument is housed in a small, modern shaped boot, made from polycarbonate and Desmopan (a thermoplastic polyurethane), two materials that guarantee protection from shocks, scratches and which, at the same time, is very lightweight. The Pressure Gauge housing is made of durable chrome plated brass. The Gauge Boot has an attachment point for a clip or lanyard. The Mini SPG is equipped with a 7/16" threaded high-pressure hose.