Serial numbers of Thinlabs All-In-One Systems and Box Modules are 12 digits in length; serial numbers of ADITI Lithium Ion Batteries are 6 digits in length.
Certification stickers with serial numbers are located on the back of box client modules.
On integrated thin clients, there is a certification sticker on the back of the system;
newer models also have a 2nd serial number sticker either on the left side bezel or on the bottom of the bezel.
If the certification sticker has been destroyed, contact Thinlabs Support.