17 ultra bright T100 tritium markers The all-new ISO403 T100 tritium illuminated chronograph watch by Isobrite explodes on the scene with bursts of tritium rays emanating from the 12 o’clock bearing, which marks with ease the position and heading of the watch. The trajectory of light from our new longer tubes not only assist and enhance with night vision read capabilities but also offer a higher quality and aesthetically pleasing timepiece. The Ronda 5040.D movement in this Swiss Made chronograph assures the accuracy your mission requires with the added feature of a stopwatch. Whether you are an aircraft or vessel pilot, auto racer, diver, at the controls of a submarine or just a regular guy, this timepiece will assure you are properly equipped. When your adventure involves going deep, this diving-approved watch is water resistant to 200 meters. Constructed out of lightweight carbon fiber reinforced polycarbonate and scratch resistant sapphire crystal, the watch weighs in at only 3 ounces. Plus, the included silicone strap provides the utmost in comfort and adaptability.