Device which converts one form of energy to another. EXAMPLES Ultrasonic probes, search coils, eddy-current probes and most other detectors.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Source: IADC UBO / MPD Glossary, December 2011. Global Standards