The THS/3F Metal Detector is recommended for use on multi-product lines, where the individual products have very different conductivity characteristics. Under these circumstances, the THS/3F allows maximum sensitivity for detection of contaminating metals, both magnetic and non-magnetic and including highresistivity stainless steels, to be maintained. The automatic frequency selection function allows the THS/3F to choose the optimum frequency for the product in transit during the autolearn phase