I'm just not finding any reference to it in my searches.
You can use Alan's vCheck (Daily Report) V3 to check the HW versions.
And if you want to upgrade to version 7 you can use Arne's scripts: PowerCLI: Upgrading vHardware to vSphere Part 1: Templates and PowerCLI: Upgrading vHardware to vSphere Part 2: VM’s
Blog: lucd.info Twitter: @LucD22 Co-author PowerCLI Reference
Excellent, thank you.
Now I can extend my Powershell learning by extracting that section to be a standalone script. Woohoo!!