The Rolex Explorer II is designed for extremes. The highly visible 24-hour hand was specially crafted to optimise subterranean legibility. It can be read against the engraved fixed bezel to clearly distinguish day from night during times of perpetual darkness.
For speleologists spending days at time in darkness, the Rolex Explorer II’s renowned legibility is an essential feature of the watch, making it a vital part of their equipment. The hands and hour markers are filled with Rolex’s Chromalight luminescence - a material which emits a long-lasting blue glow, and contrasts beautifully with the sleek dial to give excellent legibility.