Isobrite is the first T100 lightweight polycarbonate watch with 10 year battery life, sapphire crystal, two tritium markers on the unidirectional bezel, 200m water resistant watch on the market. The "T" rating measures the amount of tritium in a watch. The higher the rating the brighter the watch will be. All other manufacturers of polycarbonate cases have a rating of T25. We guarantee this watch to be brighter than any other polycarbonate watch sold or your money back. But as you can see from our description the brightness is not the only unique features of this watch that sets it in a class of its own. Please check out the features and you will find this the best lightweight polycarbonate watch available period.

"Watch is very bright, and works and fits well" Thank you Robert S.

"Beautiful watch! Will be using for scuba diving, received in one day, thanks. Very very bright at night, almost too bright." Eric

"Big, bold and bright! This is the T100 watch I have been waiting for, it ticks all the boxes and compared to my Luminox watches, is in a league above. Should sell well once people know of its existence" Jimmuck