Sinn watch u1000 sdr ezm 6 bracelet the u1000 sdr is a diving watch made for the needs of professionals it is exceptionally readable and very resilient the case is made of german submarine steel that is protected from high pressure magnetic fields and seawater penetration it is also hardened through the use of sinns tegiment technology a dehumidifying capsule protects the mechanism from fogging one of the most intriguing features of the timepiece is the captive safety divers beze