====== Sinn 900 ======
{{wst>image_cr|Sinn|900}}

The **900** is an [[automatic chronograph]] by [[Sinn]] produced since [[2004]]. It was initially marketed as a [[field watch]] but transformed into a [[pilot's watch]] by [[2011]].

===== Overview =====
The expedition watch model 900, beneath a [[second timezone]], presents many time-based units on the smallest space.

Seen from the outside to the inside, the following data can be read or set 

  * By the 24-hour scale and the yellow [[UTC]] hands the day and night hours of a day.
  * By the [[UTC]] hands in conjunction with the ordinary hours hand and the sun the north direction can be determined.
  * The pilot's [[bezel]] - bidirectional rotating via the crown at 10 o'clock - allows direct, minute-precise reading of time intervals up to one hour. Average speeds between 65 and 600 km/h can be displayed with the help of a universal hour scale with base 1. This scale also allows to convert any units to their average per hour, for example the piece numbers of a production process.
  * Units per minute like pulse or respiratory rate are measured with an analog designed scale with a base 15. The average value per minute can be read directly, when the time for 15 strokes, breaths or any other countable size is stopped.
  * The red telemeter scale measures the distance of a sound source from ones own site, for example, the distance of a thunderstorm area, using the time difference between lightning and thunder.
  * At stop-minutes and hours counter, on the basis of an average walking pace of 5 km/h, traveled distances up to 60 km can be read.

To make the **Sinn 900** an adequate companion for auto testers and tour friends, Sinn engineers have engraved on the caseback the tire/speed indices and the most important conversion scales for European and American units, such as liters/100 km in miles/gallon.

In [[2009]], Sinn introduced the **900 Pilot**, a variant on the 900 with an inner [[pilot's watch]] [[bezel]] using a crown at 10 00. The solid caseback on the Pilot features an English/metric conversion chart. The Pilot model has magnetic resistance to 80,000 A/m. All non-pilot versions were retired by [[2011]], shortly after a [[PVD]]-coated "Pilot S" was added. A [[DIAPAL]] version was added in [[2013]] with the same pilot's watch bezel.

===== References =====
  * [[Sinn 900 Hummer]] (2010)
  * Sinn 900 (2004-2011) - Multifunction inner bezel and dial, [[TEGIMENT]] case
  * Sinn 900 Pilot (2009-present) - Pilot's inner bezel, applied markers, [[TEGIMENT]] case
  * Sinn 900 Pilot S (2010-present) - Pilot's inner bezel, applied markers, black coated [[TEGIMENT]] case
  * Sinn 900 DIAPAL (2013-present) - [[DIAPAL]] movement, date only, [[TEGIMENT]] case, anthracite dial


<WRAP ud ud_mod>

**Movement:**
  * Mechanical [[chronograph]] movement [[Valjoux 7750]] with [[UTC]] 24h module, 28,800 A/h
  * [[Automatic]]
  * [[Nivarox]]-1 [[hairspring]], [[Glucydur]] [[balance wheel]], Beryllium plateau
  * [[Mainspring]] Nivaflex 1, [[Incabloc]] [[shock protection]]
  * [[Shock proof]] according to DIN 8308
  * [[Antimagnetic]] according to DIN 8309

**Case:**
  * [[Stainless steel]], DIN material no. 1.4435, tegimented to 1200 HV (surface hardness in Vickers), [[satin-finished]]
  * D 44 mm, H 15.5 mm
  * [[Sapphire crystal]]
  * Integrated [[magnetic field protection]] up to 80.000 A/m (or 100 mT)
  * Screw-in [[stainless steel]] caseback. [[Screw-in crown]]
  * Pushers with integrated pusher protection
  * Gaskets of crown and pushers are made of a material with high chemical resistance used in vacuum technology and chemistry
  * Dry capsule
  * [[Waterproof]] to 20 atm
  * Safe below atmospheric pressure

**Dial:**
  * Black mat, hour indexes covered with inactive white luminous paint
  * Fine minute scale
  * Telemeter scale and direction information in red
  * [[Tachymeter]] scale
  * [[Pulsometer]] scale
  * March odometer indication in daylight color
  * Inner bezel with minutes and 24 hours graduation in daylight color, with luminous triangle

**Hands:**
  * Hours and minutes hand covered with inactive white luminous paint
  * Seconds hand and stop hand white
  * [[UTC]] hands covered with yellow daylight color

**Functions:**
  * Hours, minutes, [[small seconds]] with [[hacking seconds]]
  * [[Chronograph]] 12 hours counter, 30 minutes counter, 60 seconds counter
  * Date indication
  * [[Tachymeter]] scale from 65 to 600 km/h
  * [[Pulsometer]] scale and breath counter from 16 to 200/min.
  * Rotating inner bezel with 60 minutes division with luminous triangle and 24 hours subdivision (2nd time zone)
  * Display of the north direction by Sun or hour hand and arrow pointer or by a [[second timezone]] (with bezel)
  * Telemeter up to 20 km
  * March odometer up to 60 km
  * Conversion scale for European and American troops on the ground Temperature degrees Celsius to degrees Fahrenheit
  * Fuel consumption Liter/100 km in miles per gallon (mpg)
  * Speed Kilometer per hour in miles per hour (mph)
  * kPressure MPa in kilo pound per square inch (ksi)
  * Tire pressure bar in pound per square inch (psi) and speed indexes for car tires.

**Bracelet: **
  * Black cowhide leather strap with [[satin-finished]] [[stainless steel]] clasp or fine-membered [[satin-finished]] [[stainless steel]] bracelet, tegimented

**Warranty: **
  * 3 years
</WRAP>

{{tag>Watch_models Chronographs Sinn_Pilot's_Watch_models Sinn_Instrument_Chronograph_models}}