https://www.harborfreight.com/12-in-drive-25-to-250-ft-lb-digital-torque-adapter-58706.html

I know this is out in the weeds for some on here, but there is plenty of reviews online that say these are accurate. I've torqued bolts up to 670 ft# with the 3/4" adapter. Accurate? I don't have hard data to prove if they are or not, besides the quality control paper that comes with the adapter, same as a snap on wrench.