We provide handheld trace explosive and drug detectors, adopting advanced fluorescent detection technology, can detect over 40 kinds of explosives including TNT, DNT and nitro explosives, black powder, ammonium nitrate, and some types of narcotics including methamphetamine, ecstasy, magu, caffeine, barbiturates etc. These devices can detect trace explosives by one in one billion, the highest test level in the world, and can be widely used for defense and public security, at rail and bus stations, ports, borders, large-scale gatherings etc.