Sinn UX EZM 2 B Hydro on Strap


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• Verified Owner Reviews (10 reviews)
SKU: SI-122

Watch Brand: Sinn

Sinn North America


Diver's watch with quartz movement and oil filled case
• Watch diameter (mm): 44.0
• Watch height (mm): 13.3
• Lug width (mm): 22
• Lug to lug (mm): 50.5
• Weight - head only (grams): 105
• Water resistance: 5,000 meters
• Case back: Solid
• Case finish: Matte
• Case metal: Submarine steel
• Dial color: Black
• Front crystal: Sapphire
• Tegimented: Bezel only
• Calibre: ETA 955.652
• Movement: Quartz oil filled
• Manufacturer's limited warranty: 3 years
• Strap or bracelet: Strap
• Warranty service: Sinn Germany

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WatchBuys Direct Price: $2,710.00
Availability: Temporarily Sold Out





Sinn UX EZM 2 B Hydro on Strap
Sinn UX EZM 2 B Hydro on Strap

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Product Details

The Sinn UX pushes watch technology to the limits. Like the Sinn U1 and U2 watches, the Sinn UX features a case made from the same submarine steel that is being used to build the latest generation of German military submarines.

The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany’s North Sea shipbuilding yards who construct submarines from the very same steel. 

This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized.  The watch movement itself is protected from magnetic fields up to 4,800 A/m.



Unlike the Sinn U1 and Sinn U2, the Sinn UX features a quartz movement rather than a mechanical movement.

By using this type of movement, Sinn is able to fill the watch with oil, which has the double affect of greatly enhancing the readability of the dial and time from any angle (including under water), and increasing the water resistance of the watch even at great depths.



The Sinn UX is covered with a thick sapphire crystal for extreme protection. This sapphire crystal features a special anti-reflective coating that is scratch resistant - the coating itself has been hardened to 1,800 HV.

The uni-directional ratchet operated rotating bezel is also milled from this submarine steel. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. The bezel features Sinn's Tegiment technology.

This watch is designed for operation in extreme temperature variations - it operates in temperatures between -20° Celsius to +60° Celsius. The movement is water resistant to 5,000 meters, and the case is pressure tested to a diving depth of 12,000 meters as certified by Germanischer Lloyd in Hamburg.

Matte black dial with date at 3, Super Luminova on hands and markers, and striking red seconds hand complete the design.

Other features include sapphire crystal with anti-reflective coating.  Strap is silicone rubber with double push deployant buckle and fliplock safety clasp.

Frequently purchased with this item:

Watch specifications are provided by the respective watch manufacturer and/or other sources. Although we use best efforts to provide accurate information, we reserve the right to make corrections when advised of specification changes and/or content errors.


Sinn watches feature a number of cutting edge technologies, many of which are unique to Sinn. Please note that not all Sinn watches, including the watch on this page, use all of these Sinn technologies.

Among the more notable Sinn technologies are:


Tegimented Hardened Cases

Many Sinn watches are fitted with Tegimented cases produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

Standard steel used by most watch companies has a hardness of between 200 and 240 HV (Hardness Vickers is a common scale used to measure material hardness). The Tegiment process produces a hardness of at least 1,200 Vickers which is five times harder than standard steel (and on some Sinn models up to nine times harder than standard steel).

The Tegiment process is not a coating consisting of a foreign material; instead the steel itself that has been hardened using a special engineering process that creates a hardened barrier. The base material is a type of stainless steel also used for surgical implants, and the stainless steel resistance to corrosion is further improved by the Tegiment hardening process.

The primary advantages to a Tegimented case are extreme resistance to scratches and other case abrasions, as well as increased resistance to corrosion.

Please note that certain Sinn watches are fully Tegimented (case, bezel) while others are Tegimented only on the bezel. Use the links below to view both categories.

  • View Sinn watches with fully Tegimented cases.

  • View Sinn watches with Tegimented bezels only.


Dehumidification Technology

A number of Sinn models feature cases filled with inert gas. Sinn has found that filling the case with inert gas can help prevent the introduction of moisture and humidity to the case, as well as provide a more stable environment for the oils that lubricate the movement.

The proper care of any mechanical watch movement mandates that these oils maintain both their viscosity and lubrication properties.

  • View Sinn watches with dehumidification technology.


Copper Sulphate Capsules

A number Sinn models use one or more copper sulphate capsules to absorb humidity trapped inside the case. Over time these capsules will gradually turn dark blue indicating that humidity has been absorbed.

The primary benefit to these copper sulphate capsules is a more dry and stable environment for both the movement and the lubricating oils. Together with Sinn's inert gas treatment these capsules form the basis of Sinn's Dry Hold Technology.

This technology not only provides a more stable environment for the movement, but also prevents fogging of the crystal when going from hot to cold environments or from humid to non-humid conditions (such air conditioned buildings).

  • View Sinn watches with copper sulphate capsules.


Extreme Antimagnetic Protection

Magnetism can cause dramatic swings in the timekeeping of a mechanical watch movement. People are often exposed to magnetic fields without even being aware - frequent high altitude flying, metal detectors, audio and video equipment, medical equipment and computer equipment can all cause problems with magnetism.

Many Sinn watches offer extreme protection against magnetism up to 80,000 A/m. Sinn achieves these results using a number of different technologies, including special case and case back construction, soft iron components in the case and protective rings surrounding the movement.

  • View Sinn watches with extreme antimagnetic protection.


DIAPAL Oil Free Escapement

Sinn caused quite a stir when they first released their DIAPAL technology. Beginning in 1995, Sinn began work to create an oil free escapement. With any mechanical watch movement, the aging of oil, especially in the escapement can create long term problems for that movement. Additionally, as movement oil ages, required service intervals become more frequent.

Sinn's early analysis to this problem provided a quick solution (at least in theory) - if you don't use oil, it can't age. The process began by exchanging the ruby escapements for diamonds (the word "DIAPAL" derives from the German name for diamond escapements) in order to achieve the desired effect. The designation stuck, even though today Sinn works with solutions taken from advanced nanotechnology rather than diamonds.

The result is a movement that proves so reliable that Sinn offers an unprecedented five year warranty on their DIAPAL watches.

  • View Sinn watches featuring the DIAPAL oil free escapement.


Hydro Oil Filled Technology

Sinn has developed a technology termed "Hydro" in which the entire watch case is filled with oil. Watches using this technology are based on quartz rather than mechanical movements.

By using this type of movement, Sinn is able to fill the watch with oil, which has the joint affect of greatly enhancing the readability of the dial and time from any angle (including under water), and increasing the water resistance of the watch even at great depths.

  • View Sinn watches with Hydro Oil Filled technology.


Submarine Steel

Sinn has created a line of watches featuring cases made from German submarine steel (the U Series). The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany's North Sea shipbuilding yards who construct submarines from the very same steel.

Because of the special steel used from the submarine steelmanufacturer, the case resists the effects of exposure to salt waterand salt water environments.

These cases are produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized. The watch movement itself is protected from magnetic fields up to 4,800 A/m.

  • View Sinn watches built from German submarine steel.



EZM Mission Timers

Sinn is a partner for manufacturing watches for the German Special Forces, including SWAT, Customs, FBI, helicopter police, GSG9 and other units.

Beginning with the now highly collectible (and valuable) Sinn EZM 1, Sinn has grown this collection to some of the most durable and highly functional watches made and they remain among the most popular in the collection.

  • View Sinn watches in the EZM Series.




Service Notes for This Watch

This watch is powered by a quartz movement and the case is filled with oil.

Special proprietary machines and equipment are required to change the extended life battery and to refill the case with oil.

Because only Sinn in Frankfurt has the necessary machines and equipment to correctly service this watch, you will need to return the watch to Frankfurt approximately every seven years for service.


Watch Reviews From Verified WatchBuys Buyers
100% • Verified Owner Reviews100% • Verified Owner Reviews (10 reviews)

Awesome watch and excellent service from WatchBuys

"Awesome watch and excellent service from WatchBuys"

Verified Owner Comments: This is a really neat watch - rugged as a tank and ACCURATE. The oil (filled) feature makes the watch look almost "digital” in appearance (angled viewing). Best watch I have ever owned. Excellent shipping/service. Thank you.

My favorite watch ever

"My favorite watch ever"

Verified Owner Comments: My favorite watch ever. It came already set to my time zone and within one second of atomic time and has stayed right there. Because it's oil filled the dial is bright and always perfectly visible without glare, at any angle.

I'll be looking at other Sinn models from now on.

Give quartz a chance!

"Give quartz a chance!"

Verified Owner Comments: I usually prefer mechanical watches. Quartz watches are fine, but they serve a different purpose. A quartz watch is a set it and forget it kind of tool. And that is what I needed when I started looking for a quartz watch that I could live with. My needs were specific: I needed to be able to drum, play ice hockey and ride a vibrating V twin motorcycle while wearing it. Of course, not all at the same time. Haha. I considered G Shocks and owned quite a few of them over time: the Frogman, Rangeman and a couple of the Master Of G versions. They were all a bit too clunky for me. It probably came down to how the rubber bands fit my wrist. Invariably, they would irritate my wrist with hard use. I started looking at the UX 2 years ago. It was a funky, utilitarian watch with interesting technology. And it seemed like it could withstand rough use at extreme temperatures. It also was highly legible at all angles.I was really intrigued by the oil-filled case and how it was possible to re... - more details

The UX surpasses all rivals

"The UX surpasses all rivals"

Verified Owner Comments: The Sinn UX is probably the ultimate, luxury, tool watch in the world today. Thanks to the over-engineered, oil-filled, German technology from Sinn, the UX can go to ANY depth (the movement is limited to 5,000m, but the case will survive ANY depth on earth!) the oil-filled case also means that you always know if the watch has lost its water-resistance (unlike other watches where you never quite know), Submarine steel with hardened, tegimented bezel perfect, unrivalled clarity of the dial - even under water - at any angle 7 year battery life Shockproof Anti-magnetic Sapphire crystal,

Super-accurate, thermo-compensated ETA quartz movement service costs similar to (or cheaper than) mechanical watches, etc., etc. And, amazingly, it's only 13mm thick, so it fits under a cuff as well :) For the money, there's nothing better IMHO.

Sinn UX EZM Hydro - Awesome Watch

"Sinn UX EZM Hydro - Awesome Watch"

Verified Owner Comments: I love my Sinn UX EZM Hydro. Totally different from my Sinn U1 - I LOVE both of them. I am always getting comments on both watches.

Amazing engineering!!

A Great Watch

"A Great Watch"

Verified Owner Comments: Totally overjoyed that I purchased the Sinn UX EZM 2 B Hydro.

The size, weight on the wrist and clarity of the dial are absolutely perfect.

It has quickly become my everyday watch of choice for all occasions.

The one of a kind Sinn UX

"The one of a kind Sinn UX"

Verified Owner Comments: Unlike any other watch. It may look like other divers, especially its brothers the U1 and U2, but the UX is unique.

It has striking clarity, the most accurate quartz movement made and engineering that puts Rolex to shame.

A great watch that looks great on the wrist.

UX Hydro on strap

"UX Hydro on strap"

Verified Owner Comments: Excellent watch that is always accurate.

The case, bezel and crystal are all scratch-free after three years of wear.

Only suggestion is that I would get the tegimented buckle, as this is the only portion of the watch that shows any wear (fine scratches).

UX EZM 2B

"UX EZM 2B"

Verified Owner Comments: Love this watch!

UX Hydro...GREAT WATCH!

"UX Hydro...GREAT WATCH!"

Verified Owner Comments: I have owned several Sinns and have loved all of them, when the U1 came out I had to have one...great watch, the feel and look of is so substantial. I recently picked up a UX Hydro...BEST I'VE HAD SO FAR !!!

Usually not a Quartz fan but this watch is "spot on" accurate all the time, and per the manufacturer's review it is the most "readable" watch I have ever owned. Regardless of how extreme the angle of vision every character and marking is crystal clear.

Nice job SINN!!!