The Swiss Army Ruby Altimeter Plus by Victorinox is loaded with an innovative collection of activity-specific tools. With its 17 features, the Altimeter Plus is the perfect companion while climbing, hiking, or mountain biking.This precision tool is made of high-grade stainless steel for lasting durability and performance. Besides calculating the altitude, the altimeter feature can be used to help predict the weather, too. If there is a change in the altitude displayed without any change in location, a change in atmospheric pressure has occurred. The difference between the Altimeter and the Altimeter Plus is the addition of a wood saw on the Altimeter Plus.