The Altimeter watch is a small authentic outdoor computer. Featuring multiple functions (compass, altimeter, barometer…) Suunto watches are a must-have in the mountains to measure and you record your performance. Don’t forget to readjust your altimeter! An altimeter is adove all a barometer that measures evolution and atmospheric pressure. Pressure variations caused by meteorological changes affect altitude measurement. Therefore it is necessary to make data reliable by recalibrating the altimeter as soon as we cognize the altitude of the area.