Tusa Pressure (500 Psi), Depth (Feet), & Compass (North Hem) GaugeThe Tusa Pressure (500 Psi), Depth (Feet), & Compass (North Hem) Gauge provides three essential readings in a compact, all in one instrument for scuba and diving adventures. Keep track of air pressure, depth, and direction while exploring underwater. The 500 psi gauge helps monitor remaining air, the depth readout is shown in feet, and the North Hemisphere compass supports navigation during dives. Designed for reliable performance in demanding water