Aräometer (Hydrometer), as used in many Ships and U-Boats! Was used by crew members to test the density / salinity of salt water. This was important when determining the torpedo time delay settings on U-Boats. Made of glass and steel. This is a SUPERB example, and comes COMPLETE with it’s original cardboard tube! Numerous markings and stamps throughout, with NO breaks, cracks, or damage! Appears to be 100% functional! 11.5 in length, it was b. Rought back by a US veteran. Would make a FANTASTIC addition to any collection, or display! TERMS OF SALE. Most of my items are vintage, and as such are AS-IS, so you must therefore expect a degree of wear due to age and/or usage. ABOUT ME. Although my passion is the Me109, I do offer many other German Aircraft Fw190, Me262, etc. , as well as USAF and Japanese items. Occasionally I do offer many non-vintage items such as prints and art relating to the time period. Use is solely based on my authorization only. The item “WW2 German Kriegsmarine Navy Aräometer TORPEDO HYDROMETER #2 VERY NICE” is in sale since Saturday, March 16, 2019. This item is in the category “Collectibles\Transportation\Boats & Ships\Military\Other Naval Collectibles”. The seller is “messerschmitt*109″ and is located in Malibu, California. This item can be shipped worldwide.