There's an underwater world that few have experienced first hand.  There's an underwater feeling of not being in total control that is strangely serene.  Consider yourself one of the lucky ones if you have had an opportunity to experience being immersed in the deep blue.  Whether you like to snorkel or scuba dive, HawkEye Handheld Depth Finders make an excellent underwater range finder.  Point them at the bottom, and know exactly how far the bottom is away.  Point them at the surface and verify your dive watch is working properly.  Point them at a distant object, or the bottom of the boat.  No matter where you point them our DepthTrax Sonar will deliver instant, accurate readings.  An integrated temperature sensor will also give air and water temperature readings.  So, venture out into the deep blue, immerse yourself, and consider yourself one of the lucky ones.