The Mares XR SPG52 is a compact supmersible pressure gauge with a 52mm face, tempered glass & brass body. Tough & chuncky you can clip this gauge off & forget about it until you need it. Tough Tempered glass face & double chromed, mirror-plated brass case protect the internal copper beryllium bourdon tube that never goes out of calibration even with hard knocks. Simple The uniform gauge is clear & even with colour coded sections for a quick & easy read. The card is luminescent so it will glow in the dark after a light charges it. Specifications Hose Length 56cm