IEDS have been made and used in a number of bombings where the initiating system was based on a modified barometer or altimeter.

Securesearch offers several such inert training devices that function electronically based on change of air pressure / change of altitude of an aircraft.

Some such devices are armed by one barometer and fired by a second barometer or altimeter.

As these instruments are commonly available, security personnel—particularly airport luggage screeners—must be trained to recognize them as IED components, or their place in assembled IEDs.