Sinn watch u212 ezm 16 leather the diving watch u212 ezm 16 is made of high strength seawater resistant german submarine steel and is 47 mm in diameter the sinn technologies used in the u212 ezm 16 make it a robust and accurate instrument for professional diving operations for example ar dehumidifying technology ensures greater functional reliability and freedom from fogging temperature resistance technology guarantees the functional reliability of the watch in temperatures ranging f