The Casio Protrek Triple Sensor Atomic PRW-3000-1d watch is an amazing contraption. Powered by solar and atomic technology, it harnesses the elements to show you more than just time. The triple sensor lets you take altitude measurements, read atmospheric pressure, and even see how far away from the equator you’re standing on a gradient map. Its mineral glass face is resistant to low temperatures. Casio Protrek Atomic PRW-3000 Watch comes from a lineage of other watches that can be categorized as “tactical.” Named after the acronym for “Precision Range Watch,” the PRW line has been delivering tactical functionality since 1985. The triple sensor is a new innovation, however, and it’s available in the Casio Protrek PRW-3000, along with high altitude measurements and atomic timekeeping.