Seiko Prospex Diving Computer NX 100m Watch
Model # SBDK001

The Japanese version of the Legend STN009J. SEIKO’s spectacular dive computer is a combination of modern electronics, materials, and design is made from Titanium alloy and the finest materials. Very useful for divers up to 328 ft (100 meters), adventurers, collectors…

While undersea mechanical complication captivates the imagination and interest of the mechanical watch enthusiast, the real-world direction of depth gauge equipped divers watches lies in another direction. The Nitrox-capable wrist dive computer by Seiko is a state-of-the-art example of the breed. Nitrox is a mix of nitrogen and oxygen used by "technical" sport divers to lengthen dive times and to reduce the risk of decompression sickness and nitrogen narcosis - not really to increase maximum depth. Nitrox evolved from military and commercial diving, and is still somewhat controversial for sporting use due to the high standard of quality, control, and special processing needed for the exotic gas mixtures.



Introduced in December of 2000, the Seiko Marinemaster NX dive computer is the commercial version of a professional watch developed by Seiko Epson for a private experimental project in the North Sea. A massive 53mm in diameter and 16.7mm thick, the titanium case is actually water resistant to 1000 meters, while the computer functions and depth gauge have been operationally limited to 99.9m by edict of Seiko's legal department. I expect that the original was designed for other mixed gas diving using mixtures like Trimix. Trimix is a blend of oxygen, helium, and nitrogen, which is used primarily for military and commercial diving, and was recently adopted by "advanced technical" scuba sport divers to go as deep as 200m (the Trimix scuba world record is 308m) - a usage even more controversial than Nitrox. While this model is sold in Asia and Europe by Seiko, North America has a further redesigned model private label distributed by Divelink as their own Nitrox Bathymetric Underwater Gauge.

Watch movement：Quartz
Analog reading
water resistance: 100m for diving

Automatic calculation starter(start calculating from depth 1.5m)
Content of display:
(No decompression diving)
Diving time
Present depth
Maximum depth
Amount of nitrogen in the body bar graph
Time to be possible to dive without decompressing
Water temperature

(Decompressed diving)
Diving time
Present depth
Maximum depth
Amount of nitrogen in the body bar graph
Decompression stop depth
Decompression stop time
Total surfacing time



(Demand display)
Time
Amount of oxygen in the body bar graph
Setting(FO2・PO2)

Various warning functions:
Floating speed warning
Decompression dive warning
Violation of stop decompressing instruction warning
PO2 warning
OLI warning
Outside measurement warning

Measurement performance:
(Depth measurement)
Range of display unit meter measurement:1.5m〜99.9m(0.0m is displayed by less than 1.5m. )
Unit of measurement:Measurement cycle 0.1m onesecond(Dive time measurement)
Every minute in total of measurement range 0〜599 minute

(Height rank measurement)
4 ranks measurement up to 6000m

(Water temperature measurement)
Range of measurement:-5c〜40c(Every 0.1c)
Material
Case  Brightman titanium
Band  Brightman titanium
Dial plate color  Liquid crystalSize
Thickness 16.7mm
Weight  118g