> could someone tell me the best / easiest method to test salinity of sea = > water in a certain area. i once remeber seeing something about a = > "hydrometer". all the best and i wish every one a great day . mark = > bethke If you don't need extreme accuracy, you can use a simple hydrometer made for use in salt water aquariums and available from any good aquarium supply store. The one I have is called SeaTest and consists of a rectangular plastic container about 10 cm. in maximum dimension, containing a swivelling plastic pointer/float that indicates specific gravity on a scale of 1.017 to 1.027, the usual range of seawater. It is quite durable and would be easy to pack and use. -- Cecil Bankston Baton Rouge, LA, USA