Iche iche na ngwaahịa nke ntụ ntụ Metal Detector, na-enye ngwaahịa oyiyi na isi kwa na onye ọ bụla Powder Metal Detector na Pipe Metal Detector N'ihi Powder; Anyị bụ ndị a ọkachamara Chinese emeputa nke ntụ ntụ Metal Detector, na-atụ anya gị imekọ ihe ọnụ!