The FORTIS 671.15.45 Marinemaster Blue Chronograph model from the Aquatis Collection unites sportiness with robustness. Its carefully considered functionality makes the Marinemaster chronograph the perfect sports device for demanding and professional divers. Typical characteristics for the Marinemaster include the unidirectional turning bezel, large but easy to read numerals, and intense Super-Luminova coating on the indices and hands that lights up in blue. The Marinemaster Chronograph models have been tested under special pressure conditions in freshwater and salt water. The Marinemaster Blue Chronograph has the historical FORTIS submarine motif engraved on it, reflecting its enormous robustness. The second hand also strengthens the nautical look with its “bulls-eye”, just as the solid turning bezel, also suitable for diving gloves, does. With the chronograph functions, aquatic athletes can make measure how long they need for their turns and drags with to-the-second accuracy. No matter if it is on or under the water, with 20 bar water resistance the Marinemaster constantly tells you how much air you have left.