Goring Kerr Metal Detector. Model: Tektamet. S/N: 20531. Sensitivity tested with test strips as 1.0 mm ferrous metals, 1.0 non-ferrous metals, and 2.0 mm non-magnetic stainless steel. Actual numbers may vary depending on local site conditions, product tested, and other factors. Maximum aperture/clearance above belt: 22 in. W x 3 in. H. Electrical requirements:120 V, 50-60 Hz, 1 phase. Overall dimensions: 40 in. L x 14 in. W x 15 in. H.