u/Due-Professor1830

How do chaps.

Back in 2010 I did my 17th Edition and bought the above meters brand new. Due to personal circumstances I never did anything sparkywise and they're unused. I now want to go back to College to do the 18th Edition and finally do something constructive. My question is are these still relevant for 18th Edition testing and if so, do they need to be recalibrated even though the've never been used ? Thanks for any advice and help I appreciate it