What is GTLS?
GTLS is an abbreviation of Gaseous Tritium Light Source – a tiny self-powered light that glows far brighter than phosphorous paint, providing a dial illumination that is self powered and constantly working without the need for batteries or charging by sunlight. Nite watches feature a GTLS on each hour marking, all three hands and on bezels where applicable.

How does it work?
Each GTLS is a minute glass vial which is internally coated with phosphor, pressure injected with gaseous tritium and sealed by a CO2 laser. As the gas decays, the electrons emitted from the tritium excite the phosphor to create a continuous cold light that is entirely self-powered. GTLS are guaranteed to glow for 10 years but will actually produce a glow for much longer.

Screw or push-in crowns with multiple O-ring seals* provide water resistance up to 660 feet (*SX5 & SX10 feature single O-ring seals)	Ronda movements (Swiss made-Swiss parts) chosen for their precision and reliability	Solid steel screw-in pin bars ensure straps & bracelets cannot work loose or fail- facilitates quick and easy changing.	All metal bracelets contructed from solid stainless steel with a double-locking clasp- won't break and twist
View Nite Tritium Sport Watches
Solid stainless steel straps lock directly onto the case- for maximum strength and reliability	Tough hard wearing polymer straps feature double toothed solid stainless steel buckles & "locking looper" design- ensures that your watch remains securely on your wrist.	Polished laser engraved stainless steel back plates- for maximum durabulity and comfort.	Domed sapphire crystal with triple anti-reflective coating*- provides high visibility, scratch resistance and maximum dial protection. (*SX5 & SX10 feature slim-line K1 hardened mineral)

---

What are the benefits of GTLS illumination?

The Nite dial illumination system offers many benefits:

•	Clear watch visibility in any light condition, including complete darkness.
•	Hands-free dial illumination – important if engaged in outdoor pursuits such as mountain biking, running, hiking, etc.
•	Does not require the watch battery to work – eliminating unnecessary drain and shortening of the battery’s life.
•	Does not require charging by sunlight meaning the level of glow is completely unaffected by adverse weather conditions.
•	Entirely self powered resulting in maximum reliability.
•	The enjoyment of owning a watch with technically innovative features.

Nite watches offer the following features to maximize strength – no matter how tough things get, they won’t let you down.
•	Ultra-bright GTLS dial illumination guaranteed for 10 years	•	Special locking system on all polymer straps for added security
•	High grade stainless steel case and bracelets	•	Calendar date window
•	Full length solid pins to eliminate strap failure	•	Long life batteries
•	Sapphire crystal glass for maximum scratch resistance	•	Water resistance to 200m
•	Metal bracelets or polymer straps with double locking clasps and buckles	•	Screw down crown with double O-rings

---

View Nite Tritium Sport Watches

---