The gauge case is made from nickel plated brass The dial window is made of highly shock resistant material (anti-splinter polycarbonate) A specially designed housing protects the gauge and HP hose fitting from accidental damage A large loop area designed into the housing allows for easy attachment. There is an over-pressure capsule fitted in the back of the module to prevent the screen from exploding in the unlikely event of the internal mechanism failing. The compass ratchet bezel is robust and can be rotated with ease even with thick neoprene gloves The numbers and directions on the compass bezel are large and very easy to read The luminous compass dial with a vivid and clear display makes quick work of compass direction even in poor visibility