The 3M Scott Fire & Safety cylinder pressure test gauge consists of a nickel-plated brass body that incorporates a bleed valve, operated by rotating a finger screw. The gauge mounted into the top of this body is a 350 bar gauge with a luminous face. The handwheel and liner enables the test gauge to be screwed into both 200 and 300 bar cylinder valves with an EN144-2 thread and allows the cylinder contents to be checked quickly and easily with minimum loss of pressure.