It was a “B-D” antigen “15 minute” machine:
https://www.bd.com/en-us/offerings/capabilities/microbiology-solutions/point-of-care-testing/bd-veritor-plus-system-for-rapid-covid-19-sars-cov-2-testing
Musk Tweet: https://twitter.com/elonmusk/status/1327125840040169472
thx.