Agilent Technologies U3401A User's And Service Manual page 22

1 Getting Started
Original packaging
Containers and materials identical to those used in the factory packaging
are available through Agilent Technologies office. If the instrument is
being returned to Agilent Technologies for servicing, attach a tag
indicating the type of service required, return address, model number, and
serial number. Also mark the container FRAGILE to assure careful
handling. In any correspondence, refer to the instrument by model number
and serial number.
4 U3401A User's and Service Guide