"Extra measure" refers to doing something more than what is required or expected. It means going the extra mile or putting in additional effort or actions to ensure that something is done well or completed successfully. Full definition
Dual - stage front airbags and a driver's knee airbag offer extra measures of protection in the cabin. (kriegerford.com)
Still, it's good to take extra measures if you're on it. (refinery29.com)
Even though you should use a lens filter each and every time, you should also make sure to properly clean the tip for extra measure! (earlymomentsmatter.org)