Inert Mechanical Altimeter Switch

The X-ray correct, inert mechanical altimeter switch contains all of the necessary components of an improvised explosive device (IED). The circuit board contains an X-ray correct battery, wire, switch, detonator, and inert explosive.

Powered by two C batteries, this IED circuit would be activated by rotating the bezel on the altimeter to the desired elevation. Once the elevation is reached, the altimeter needle will complete the circuit. The X-ray correct ANFO (ammonium nitrate-fuel oil) simulant is engineered to have the same density and effective atomic number (Zeff) as the real explosive threat.