To submit a ticket on the KnowledgeHub, you need to provide a serial number for the instrument it is regarding. The serial number can be found in two places on the instrument:

Every instrument has a sticker with the Serial Number (S/N) on it.
This sticker can usually be found on the side or back of the instrument.
If you have had your instrument calibrated with James Heal, there will be a card on the instrument.  The serial number is written on the top of this card.

A PDF version of this FAQ is available for reference.