Securina is a professional manufacturer and supplier of security metal detectors and industrial metal detectors from China. Inside the video is our small tunnel size: 400(W)x100(H)mm conveyor metal detector with the no-load test in the sensitivity: Ferrous(mm): 0.8 diameter metal ball Non-ferrous(mm):1.2 diameter metal ball SUS-Stainless Steel(mm):2.0 diameter metal ball Also, make testing with noodles demonstration. Microcomputer control, automatic learning and training, automatic sensitivity setting according to different substances. See the video for details. Welcome send inquiry to Email: info@securinadetection.com Welcome visit us: www.securinadetection.com