Do not be mistaken! There are definitely a difference between the 2 labels.
SHA Extra Plus (SHA++) hotels are those that meet the Amazing Thailand SHA Plus standard but also provide an accommodation service in partnership with certified hospitals for the RT-PCR test.
SHA Plus (SHA+) hotels means that the hotel not only meets the usual SHA certification criteria but also at least 70% of hotel or business staffs have been fully vaccinated against COVID-19.
For the new Test & Go Scheme, travellers are required to book the SHA Extra Plus Hotels!