Digital barometer is an application that shows the atmospheric pressure. This is done thanks to the pressure sensor device, "if your device lacks pressure sensor" do not put a negative note, the same application indicates that you do not have the pressure sensor and you mark 0.
The measure will give us the pressure in hectopascals (hPa) and taking as a basis the sea level pressure of 1032 hPa.
By using the pressure sensor device application you need not be connected to the network.