We have several torque wrenches with some being clickers and some beepers. For all of them we have an old beam type wrench we chuck in a vise and put two welded together sockets ( 1/2, 3/8 ) to calibrate the fancy ones. Unless the beam type has been in a fire or the pointer doesn't return to zero it's accurate. The clickers and beepers are handy where the pointer can't be easily seen.
