> 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.
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       Cecil Bankston
    Baton Rouge, LA, USA