Having last thought about this mob 4 years ago, I've long since forgotten them, until I reminded myself reading this thread. "Oh look: there's me!"
On the one hand, TGB Diagnostics is in the right place, and they're getting their Coronavirus testing product certified and so could one not expect handsome sales?
On the other hand, today's announcement of European CE mark approval
https://www.asx.com.au/asxpdf/20200318/pdf/44g533jcts26zx.pdf
is the second time in 3 weeks that this mob has make what is surely a price-sensitive announcement, without marking it as such on announcement-issue, which is not a great look.
From a tiny market cap a few days ago, to about $60 mill now (a 10-fold increase) I'd be pretty cautious.