Altimeter Thermometer Barometer: Precision At Your Fingertips: Measure and monitor environmental conditions with ease, thanks to the integrated sensors that deliver accurate readings. Multi-function Device: All Your Needs Covered: A true all-rounder, this device combines multiple functions into one, offering unparalleled utility for outdoor enthusiasts. Easy To Carry: Adventure Made Simple: Its compact size and lightweight design make it a breeze to carry, ensuring it's always handy when you need it most. Battery-Free: No Hassle, Pure Adventure: Experience the freedom of a device that doesn't require batteries, allowing you to focus on your journey rather than recharging. Survival Compass Tools: Navigating With Confidence: Whether you're scaling mountains or trekking through forests, rely on our compass tools to guide you safely through your adventures. Embark on your next outdoor escapade with peace of mind. Our altimeter thermometer barometer is not just a tool—it's your trusted sidekick, designed to enhance your experience while keeping you safe. Its pure mechanical structure stands the test of time, ensuring durability even in the toughest conditions.