They make tq testers. But those also have to be calibrated as well from time to time IIRC. They are also not cheap. We use this style at work:
https://www.toolup.com/Proto-J6476-E...4aAogfEALw_wcB
Honestly as long as you set them back to zero, are gentle with them, only use them for tightening, and it's not used all that often they last a decent while in calibration from my experience. Then again I have always used high quality tq wrenches from the beginning, I imagine cheaper ones will get out of spec much quicker. If you use them daily in a shop or in manufacturing it makes sense to at least check them for accuracy on a normal schedule. It is part of our PM schedule for all tools/machiones/ etc.
Yes the fancy digital ones like the ones from snap on or CDI are nice. But do you really need a $700 torque wrench?
https://shop.snapon.com/product/Tech...)/ATECH3FR300B
My buddies race lemons, the only things they tq is their lug nuts.
I usually only use my tq wrench for a few specific fasteners that I am anal/concerned about. 90% of the fasteners on personal cars I have worked on have been hand tightened and never had any issues or anything come loose or stripped because of over tightening.
It is your money. If you sleep better at night go for it.