... 3.color box packing MD-300 Handheld Metal DetectorHand held Metal Detector designed to safeguard security-sensitive areaslike schools, courtrooms, corrections facilities ... , low failure rate.2, sensitivity is very easy to detect the size of a pin (or even less), metal items. Requirements under the ... * 380 * 325mm (20 support / box, 7.4 kg / box) Portable Hand-held Metal Detector MD-300