Originally Posted by screenerx
I know I never noticed anything different in regards on how the HHMD rings or acts when it's in the presence of a large metal source such as a weapon other then a sustained alarm from it.
Actually, you can (in my experience) determine the
relative density and mass of the metallic object based on the distance from the item that the HHMD alarms. For instance, a gun in a pocket will cause the HHMD to alarm farther from the pocket than a penny will.