Adopt the most advanced digital detecting technology in the world , JH-4 scanner gate is special for detecting metal and alloy articles concealed in human body. It is highly safe, widely applicable and highly sensitive with a wide detecting range and a good anti-interference capability. The user can configure the gate according to the size and weight of the article for detection to exclude error alarm for coins, keys, jewelries and belt buckles. It is applicable in the places such as factories, mines, banks and luxuries houses, where expensive metal articles may get lost easily; and places such as airport, customhouse, jails, exhibition halls, where dangerous metal articles are prohibited.