Sun Company Altimeter 203 - Battery-Free Altimeter and Barometer | Weather-Trend Indicator with Rugged ABS Case and Lanyard | Reads Altitude from 0 to 15,000 Feet RUGGED ABS HOUSING - Durable ABS plastic case keeps Altimeter 203 protected. Lanyard is included.. ACCURATE READINGS - Adjustable dial lets you account for high or low pressure systems so that you get the most accurate reading possible.. BATTERY-FREE - This analog altimeter is battery-free and simply adjusts based on the surrounding barometric pressure.. EASY-TO-READ SCALE - Easily measure altitude up to 15,000 feet. Barometric pressure is measured in inched of Mercury (Hg).. FULL INSTRUCTIONS INCLUDED - Easy step-by-step instructions help you learn how to set and adjust your SUN altimeter.. Model number: 203-F. Made in Japan.