Six Functions - Includes Altimeter (Range: 0 - 15,000 feet), Barometer, Ball Compass, Dial Thermometer, LED Light, Signal Mirror. Great addition to your car or truck and is an essential travel accessory. Battery-Free - This analog altimeter is battery-free and simply adjusts based on the surrounding barometric pressure. Simply mount the adjustable base to dashboard for easy visibility. Can easily detach and become portable! Accurate Readings - Adjustable dial on altimeter lets you account for high or low-pressure systems so that you get the most accurate reading possible. The Japanese made barometer, liquid-damped compass, and dial thermometer are all designed for easy, precise readings. Easy-to-Read Scale - Easily measure altitude up to 15,000 feet. Barometric pressure is measured in inches of Mercury (Hg). Keep it in your car, truck, or vehicle to keep track of altitude changes while driving. Full Instructions Included - Easy step-by-step instructions help you learn how to set and adjust your Sun Company altimeters/barometers. Everything you need for adventuring in one unique instrument. The Navigat’r 6 is an altimeter, barometer, ball compass, dial thermometer, LED light, and signal mirror. Simply mount the adjustable base to dashboard for easy visibility. A great addition to your car or truck and is an essential travel accessory that can easily detach and become portable! When you get to the trail, bring the Navigat’r 6 with you. Measures altitude up to 15,000 ft (or 5,000 meters).