This is amazing. Devices like this, if they can be expanded upon to be able to detect multiple viruses, would be a real game changer as far as spreading contagious illnesses goes. It could also help immunocompromised people know if somewhere is safe to be.
Fingers crossed that this sort of technology actually gets adopted and rolled out and becomes cheaper over time, and isn't just one of those many fantastic inventions you read about and then never hear of ever again.