If you're using a
non-EEVblog discount code that is provided by TEquipment.net during a special sales event (like TEquipment's recent Black Friday SAVE7 discount code) make sure that you make your purchase using the code before midnight Eastern Standard Time.
During the TEquipment.net's recent Black Friday sale, I used their SAVE7 discount code to buy a new multimeter. Later that weekend (the Black Friday sale went until midnight Sunday) I attempted to use the SAVE7 code to buy a Rigol oscilloscope after 9 pm Pacific Time on Sunday, only to get an error message telling me that the SAVE7 code was invalid.
The following day a TEquipment customer service rep confirmed to me that the midnight expiration time for discount codes they provide is effective midnight their time, which is USA Eastern time... which is 9 pm my Pacific time.
I didn't buy that Rigol oscilloscope.