The Garrett Operational Test Piece (OTP) 1600600 is a useful Metal
Detector Accessory for Walk-Through Metal Detector Testing. The Operational
Test Piece by Garrett is designed to mimic the size, shape, and composition
of a forbidden object for testing and verifying calibration settings of walk-through
metal detectors. The Garrett Operational Test Piece OTP 1600600 is made to meet
the specifications of the Federal Aviation Administration (FAA).