Dive gauges are made of different types of material and specifications. An accurate and high-quality pressure gauge ensures that the gas reading is correct. 45mm slim gauges are popular with divers using them on deco/stage cylinders, whereas the 52mm glass and brass version are used for back mount diving.
Gauges with rubber or protective boots are a double edge sword. The rubber boot helps protect the SPG, but on the other hand, it traps lots of saltwater which leads to corrosion, debris entrapment, which damages the air spool after a while.
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