The GreyScan ETD-100 has been developed in response to the increasing global threat from homemade explosives based on inorganic salts (fertilizer and other compounds) with US and Australian Federal Government support. US Government broad agency announcements have requested a device that is - - Able to detect home made inorganic salt based explosives (nitrate, chlorate, perchlorate) - Highly sensitive - Low/no false positive rate - Suitable for field deployment (not lab based) - Simple to operate