1990 Goring Kerr Metal Detector. Model: Tek 21. Model (conveyor): 84AL141NTRR. Belt type: Intralox 700-Series. Belt width: 14 in. Maximum aperture/clearance above belt: 1 ft. 4 in. W x 9 in. H. Sensitivity tested with test strips as 2.5 mm ferrous metals, 2.5 mm non-ferrous metals, 2.5 non-magnetic stainless steel. Actual numbers vary depending on local site conditions, product tested and other factors. Power supply: 110 V. Leeson electric motor, 1/3 hp, 1725 pm, 208-230 V/460 V, 1.3/1.7 amps, 3 phase. Boston Gear speed reducer, ratio: 30:1, rpm out: 57.5 (final), torque: 340 lb-in. Conveyor infeed/exit height: 1 ft. 11 in. Overall dimensions: 8 ft. 4 in. L x 3 ft. 4 in. W x 3 ft. 3 in. H.(ACN139).