Ideally with your supplier.
But be aware that wattmeter, aside of respecting the specs required in LAOS, must be APPROVED BY EDL (meaning having a chop somewhere on certification doc + most probably a certification on the wattmeter).
So far the thai supplier said no problem, but I’m not sure he fully understood the point.
Please check with him in thai that he understand correctly the certification part from EDL, as if not we cannot use it.
We are also checking from our side directly with EDL as a back up plan.