This is the XS Scuba Hose Mount SuperTilt Compass Features: Increased range of tilt Top and side reading Large ratcheting bezel Luminescent gauge face Rubber boot with hose mount nut Fits full size 0.5 (12 mm) high pressure hose The XS Scuba Hose Mount Super Tilt Compass is a dual-purpose compass. The convenient side window allows quick reference of large, easy-to-read bearing indicators on a luminescent display for gun-sight accuracy. Or, for divers who prefer relative navigation, the ratchet bezel can be rotated easily even with thick neoprene gloves. "