Introducing: The Sinn EZM 12 ‘Einsatzzeitmesser’ (Live Pics & Pricing)

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There very well might be no watch company more devoted to the creation of purpose-built tool watches than Frankfurt-based Sinn. And there are definitely no Sinn watches more purpose-built than those in the Einsatzzeitmesser series. Einsatzzeitmesser means "mission timer" in German, and Sinn has now devoted a dozen watches to timing various specific missions (fire rescue, SWAT teams, military divers, etc.), the latest being this year’s new EZM 12, which was designed to suit the very unique needs of air rescue professionals. I got to check it out at Baselworld last week, and boy was I impressed.

Let’s get the basic specs out of the way first. The EZM 12 has a 44mm x 14mm case made from Sinn’s famous hardened ("Tegimented") steel with a black DLC-coated bi-directional bezel also made of hardened steel. Its ETA-based automatic movement is protected to 80,000 A/m of magnetism and the watch is water resistant to 200 meters. An inert gas dehumidifying system inside the case protects it from any humidity damage, while a copper sulfate capsule contained in one of the watch’s crowns changes color to indicate any moisture penetration. On its own, the EZM 12 is a very capable sports watch that would be suitable for diving, flying, or the combination of both. But the specific design features are what set this one apart.

Sinn EZM 12 Einsatzzeitmesser wristshot

The German Air Rescue service is on 24-hour standby to respond to car accidents on the country’s high-speed Autobahn road system. The rule of thumb for these helicopter paramedics is to get to the accident scene within 10 minutes of the emergency call, and to get the patient to a hospital within one hour. Therefore, Sinn demarcated the internal rotating ring to indicate this "platinum" ten minutes and the "golden hour," providing quick reference for the first responders. The bi-directional outer bezel has a countdown scale on it for general use too.

Sinn EZM 12 Einsatzzeitmesser caseback

A second specific design feature meant to aid the air rescue crew is the "PulsRotor." This consists of a four-handed sweep seconds indicator that allows for quick read-off of a patient’s pulse using the pulsometer scale printed righton the dial. By using this four-hand rotor, the paramedic need only wait 14 seconds between pulse readings, eliminating the need for a chronograph, which would require a free hand to operate. One of the hands is painted white and acts as the actual timekeeping seconds hand for setting the watch as well.

Finally, the watch itself is designed for easy decontamination and cleaning after the job is done. The silicone strap is a clever quick release design, hooked around the springbars and held securely when strapped on the wrist. The caseback is completely flat with minimal engraving to facilitate rinsing. And the bezel can be snapped off to allowing the scrubbing of blood, DNA, and other body fluids from both the case and the bezel. Each EZM 12 is sold with a pocketknife made by the German company Böker, which has a flat blade tool specifically designed for prying off the bezel.

Sinn EZM 12 Einsatzzeitmesser bezel cleaning tool

There are a lot of so-called "tool watches" that brands try to convince you were designed for specific purposes, many of which range from questionable to laughable. But the Einsattzeitmesser series has always had the whiff of authenticity to it, if only because the watches are so weirdly specific in their designs that Sinn couldn’t possibly have built them for mere marketing reasons. The EZM 12 is a perfect case in point. 

The EZM 12 is a limited edition of 300 pieces and it is priced at $3,340. It will be available at the end of April and sold in North America only through Sinn’s distributor, Watchbuys. You can find out more here.

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