I have great faith in the 'Flexi pointer' type torque wrench, its accuracy,
however, is in the hands of the user. One needs a practised touch with this
type of tool.
The one I used for many years (until someone 'borrowed' and never returned
it) I bought it in the late '70s for #4.99 ($7.00ish). Cheap and cheerful
and never a gasket failure. As to your question, I fail to see how one of
these torque wrenches can change with age.
I now use the 'Click type' from Snap-on and it cost something like $300 and
this is progress?
TR4A CT64306 O
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