The sensitivity of JH-3 digital metal detecting gate is adjustable. In the highest volume, articles as small as a paper clip can be detected and located. The user can configure the gate according to the size and weight of the article for detection to exclude er ro r alarm for coins, keys, jewelries, belt buckles etc. It is applicable in the places such as factories, mines, banks, luxuries houses etc., where expensive metal articles may get lost easily; and places such as airport, customhouse, jails, exhibition halls, where dangerous metal articles are prohibited.