Garrett PD6500i Metal Detector Flat Test Piece. The Garrett Metal Detector Flat Test Piece 1-620570 should be tested with the Garrett PD 6500i. We are an Authorized US Distributor for Garrett. We offer complete line of Garrett metal detector parts and accessories. For our complete selection of more products by Garrett and other brands on sale please visit our metal detector parts and accessories page. Features of Garrett Metal Detector Flat Test Piece 1620570: Represents size shape and weight of small pocket knife. Package Contents: Garrett Metal Detector Flat Test Piece 1620570 Garrett PD6500i Metal Detector Flat Test Piece