It may not look like much, with just three hands and a tiny date, but the Sinn EZM 9 TESTAF will be one of the toughest watches you’ll own. For the uninitiated, the TESTAF certification is earned by pilots’ watches that pass a slew of tests, including readability, accuracy and durability during pressure or temperature changes, to name only a few. This watch also has a 44mm titanium case that’s been further hardened by a special Sinn technique, a replaceable dehumidifying system, and an anti-magnetic automatic movement capable of functioning between temperatures of -45 and 80 deg C.