An aneroid barometer is a precision, liquid-free instrument that measures atmospheric pressure and converts it into altitude or weather-related readings. Housed in a rugged, corrosion-resistant metal case, it is compact, light, and ideal for both stationary and mobile applications.The working principle is one or more sealed, partially evacuated corrugated metal capsules (corrugated tubes), which expand or contract due to changes in external pressure. Applied to meteorology, weather observation, meteorological stations, and storm warning systems; Aerospace, aircraft altimeter and spacecraft altitude measurement; Maritime navigation, ship borne pressure monitoring; Outdoor and sports handheld altimeters for hiking, skiing, and drone operations; Education, Physics, and Geography Course Demonstration Toolkit.