The FO1 TESTAF was designed to meet the an established standard for pilot’s watches set by FH Aachen known as TESTAF. Technischer Standard Fliegeruhren (TESTAF), which means “technical standards for pilot’s watches, is a set of criteria developed by FH Aachen – Aachen University of Applied Sciences for aviator’s timepieces, in collaboration with Sinn. More information on the TESTAF standards and test can be found on the FH Aachen TESTAF site: http://www.testaf.fh-aachen.de/
This watch looks tool-like and should be more then sufficient to fulfill the needs of a pilot. However, the certification unfortunately pushed the price of the watch to slightly above 1,000 Euros.
The watch has a 45 mm titanium case with a bidirectional rotating bezel held by screws. It is water resistant to 200 m. In order to meet the TESTAF standards for strap attachment, the lugs have screwed bars. And the movement inside is an ETA 2824.