When I was working we had to have all our torque
wrenches calibrated every year or so (no more than
every other year).. I use to bring mine in to have
them checked also.. I have 4 torque wrenches..most
are clicker type.. and 1 beam.. at the moment I cant
recall what brand names they all are(too many beers
I guess.. or CRS).. any torque wrench should be calibrated
to verify what you have... that includes new ones.. the
last time mine were done was 5 years ago now.. I should
have them checked again