All instruments give accurate, clear readings and are made from the bestquality materials. As such they offer perfect functionality and excellentrobustness. In essence, the 2+1 instrument combo is an Apeks 2-gauge consolewith our unique compass on the reverse. A compact system that we believe isthe best combo set available anywhere in the world. The gauge case is madefrom nickel plated brass The dial window is made of highly shock resistantmaterial (anti-splinter polycarbonate) A specially designed housing protectsthe gauge and HP hose fitting from accidental damage A large loop areadesigned into the housing allows for easy attachment. There is an over-pressure capsule fitted in the back of the module to prevent the screen fromexploding in the unlikely event of the internal mechanism failing. The gaugesare made with O2 compatible materials but ensure that they are O2 cleanedbefore use with high percentage oxygen Dials have a long phosphorescent effectfor better reading in poor visibility conditions There are 2 attachment areasintegrated into the design for position flexibility This may be a compactdesign but the displays are vivid and clear - perfect for diving. For example,the depth gauge spreads the first half of the scale and in total shows a rangedown to 230 feet Depth gauge has resettable max depth indicator The compassratchet bezel is robust and can be rotated with ease even with thick neoprenegloves The numbers and directions on the compass bezel are large and very easyto read The luminous compass dial with a vivid and clear display makes quickwork of compass direction even in poor visibility Specs SPG case materialNickel plated brass SPG dial face Anti-splinter polycarbonate SPG dial range 0 5000psi / 0 360 Bar