Replacement for the Cressi Mini SPG. Gauge is high quality instruments housed in a chrome plated brass case. The gauge has a luminescent face for easy reading in low light or night diving conditions. 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. Pressure gauge is equipped with a 7/16" threaded high pressure hose. There are two models to choose from. One model is imperial with pressure readings in psi and the other model is metric with pressure readings in bars. The Mini-Manometer Pressure Gauge (imperial) dial reads from 0 to 5000 psi. For at-a-glance monitoring of air pressure the instruments face is divided into three different colored zones: the area from 600 psi and below is highlighted in red with a solid bar and red stripes. If Gauge is used on deeper dives, the red scale extends and fades to 1,300 psi, this provides for added reserve air indication required at greater depths. From 600 to approximately 3,000 psi is Green and from 3,000 psi to end of scale is Blue. The Mini-Manometer Pressure Gauge (metric) dial reads from 0 to 350 bars. For at-a-glance monitoring of air supply the instruments face is divided into three different colored zones: the area from 50 bars and below is highlighted in red with a solid bar and red stripes. If gauge is used on deeper dives, the red scale extends and fades to 100 bars, this provides for added reserve air indication required at greater depths. From 50 bars to approximately 200 bars is Green and from 200 bars to end of scale is Blue.