Goring Kerr TEK 21 Metal Detector, Model TEK 21, S/N 46540. Unit currently is missing parts. Designed sensitivity: 2.0 mm ferrous metals, 3.0 non-ferrous metals, and 3.5 mm non-magnetic stainless steel. Actual numbers may vary depending on local site conditions, product tested, and other factors. Maximum aperture/clearance above belt: 12 in. W x 6 in. H x 13 in. L. 110 V, 50 amps, 50/60 Hz. Overall Dimensions 32 in. L x 14 in. W x 19 in. H.(H16)