Scanner 3 : A detector assembly carrying one or more transducers for detecting flaws in pipe. (See detector unit.) Often the scanner is quipped with a magnetizer and is a part of it. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}