Goring Kerr Gravity Fed Metal Detector. Model: TEK 21. S/N: 46/91/44. Maximum aperture/clearance: 8-1/2 in. dia. Sensitivity: 3.0 mm non-ferrous, 2.5 mm ferrous, 3.5 mm non-magnetic. Pneumatically operated reject mechanism with an 11 in. L x 7 in. W reject door. Electrical requirements: 110 V, 50/60 Hz. Inlets: (1) 8-1/2 in. dia. product inlet. Outlets: (1) 6-3/4 in. dia. reject chute, (1) 7-1/2 in. L x 7-1/2 in. W product discharge chute. Overall dimensions: 29 in. L x 24 in. W x 63-1/2 in. H.