The Sinn UX GSG 9 'EZM 2B' is a watch created by the German watchmaker Sinn Spezialuhren.
The watch is part of Sinn's EZM (Einsatzzeitmesser) collection, which is known for its robustness and functionality tailored for professional use, particularly by military and law enforcement personnel.
The 'UX' in the watch's name stands for "Uhrzeit Extreme," emphasizing its ability to withstand extreme conditions.
A conventional diver's watch's crystal reflects light underwater, impacting visibility. However, a HYDRO watch such as this, is filled with a fluid that shares the sapphire crystal's optical properties, prevents this mirroring effect.
This ensures the watch face remains fully readable even from oblique angles, both in and out of the water. The watch boasts an incredible 5000m water resistance which is largely due to the HYDRO technology pioneered by Sinn.