A pocket sized digital barometer that integrates atmospheric pressure, altitude, and ambient temperature, suitable for various scenarios such as meteorological observation, drone altitude determination, outdoor sports, laboratory calibration, etc. It is dustproof and waterproof, and can work stably in harsh environments such as rainstorm and sand dust. It can be read in the sun and automatically reduce brightness at night. Used for quickly deploying portable micro meteorological stations and supporting LoRa networking; Replace GPS altimeter to achieve precise altitude determination and terrain tracking; Record height profiles and generate GPX trajectories; As a secondary standard for calibrating mechanical or low-cost digital barometers; Monitor air duct static pressure, clean room pressure difference, etc.