This is a high quality brass gauge, with tempered glass, and best for recreational divers. It is best used with a HL911 Shackle Bolt Snap (NOT INCLUDED), and the pressure gauge stays clipped to the BCD for sure. The 52mm Pressure Gauge with Snap reads up to 360 bars, comes with a swivel spool, Viton O-Rings, and NICKLE back finishing. You can also choose the either in White or Black dials.