The Brookstone Altimeter M is a high-quality altimeter designed for outdoor sports enthusiasts, specifically for activities such as skydiving, para gliding, and hang gliding. Manufactured by Brookstone, this altimeter is a reliable tool that helps users accurately measure altitude and airspeed during their adventures. With its user-friendly design and durable construction, the Brookstone Altimeter M is a must-have for those who prioritize safety and precision in their airborne pursuits.