Sinn produces 4 types of so called Einsatzzeitmesser watches. They are simply called EZM1, EZM2, EZM3 and EZM4. The EZM's were designed to be used for those people whose job can bring them in a situation where time or time measuring can mean the difference between life and death (for instance policemen, firemen, and border patrols). So it is no surprise that all the EZM watches are extreme tool watches, where readability of the actual time or elapsed time is extremely important.
The EZM1 was designed with special task forces in mind. Readability was important, all other aspects were irrelevant. This is why the date function of the EZM is very discretely placed at the "4" o'clock position, it is very small and printed in red. All other printing on the dial is also done in red, so not to distract from the readability. The elapsed chrono minutes can be read very quickly because the minute pointer is placed central of the dial. This is a typical feature of the Lemania 5100 movement, and this is also one of the main reasons why this movement is so popular with a large amount of people. Also the Lemania 5100 movement is very robust, and can withstand heavy side-impacts and high G-forces.
