Odd Language #102: Tens of What?

http://www.infoworld.com/article/2924187/security/critical-vulnerability-in-netusb-driver-exposes-millions-of-routers-to-hacking.html has an interesting subhead: “Tens of routers and other embedded devices from various manufacturers likely have the flaw, security researchers say”.

The issue: In English, a word can often be used in two counting senses: one for how many of that thing and another of how many varieties of that thing. This can be ambiguous. The subhead would have been clearer if it had started, “Tens of router models”.