http://www.harborfreight.com/12-in-drive-digital-torque-adapter-68283.html i bought the pittsburhg torque adaptor from harbor freight to test my new torque wrench and it was off abit. so i grab my old craftsmen and check it. its dead on at most settings. so i adjusted the new wrench according to the adaptor. check out you tube, seems to be very accurate. $30 and you may be able to recalibrate your old wrench and save a few bucks.