A digital altimeter is a device that measures altitude based on atmospheric pressure. It works by measuring the changes in air pressure as altitude changes. As altitude increases, air pressure decreases, and the altimeter senses this change and calculates the corresponding altitude. Digital altimeters are commonly used by hikers, pilots, and climbers to determine their altitude.A digital barometer is a device that measures atmospheric pressure. It can be used to predict changes in weather, as high or low pressure systems are often associated with specific weather patterns. Digital barometers can also be used to calibrate altimeters and to monitor air pressure in sensitive equipment, such as in scientific experiments.
Digital altimeters and barometers often come as combined devices, called altimeter-barometers, that can perform both functions. They are particularly useful in outdoor activities, where knowing the current altitude and pressure can help with navigation and weather prediction. Some models also include features such as temperature sensors, compasses, and GPS receivers to provide more comprehensive information about the environment.