This is a very handy Yoke Scuba Tank/Cylinder Fill Checker The Pressure Check features: Quality product without the name brand price Check Pressure of Standard Yoke Outlet Valves Quick Bleed 2 Diameter - 0 to 5000 psi Gauge & 0 - 350 BAR Accuracy 1.5% Throughout Entire Scale Triple Chrome Plating Protective Rubber Boot Wonder no longer how much air you have in your tanks. Afford to dive with style. "