... zirconium tubes, book-walled pipe, seamless steel tubes, welded gas and oil pipelines, nonferrous metals, ferrous metals and some ... 1dBDetection channels 1,2,4,8,16 Operation mode Single probe transmitter and receiver, dual probe transmitter and ... remark information etc.Clock TypeInner, outer CLOCKEncoder50-1024 (Optional)Detector modepositive, negative, bi-directional, radio frequency (RF)Peak ...