The Vindicator was designed to be an easy to read visual safety device to prevent divers from starting a dive with their air turned partially on or turned off completely. With 9 different sized models, the Vindicator is easily retrofitted to most valves on the market. The Vindicator is an easy way to reassure yourself and fellow divers whether your air is turned on or off. Perfect for individual divers, rental departments, dive charters and open water instruction