But if they do decide to do a luggage check .................... you really got some "splainin' to do".
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I remember heading down to Ca. for work with a calibrated pressure gauge in my luggage. Had all the paperwork for me and the gauge with me. Went into secondary and the customs guy had no idea what it was but was satisfied with loads of paperwork and ushered me out the exit door.
You might want to have paperwork with you describing exactly what you've got in case he decides it's a missile guidance system for the North Koreans.