[Rawknees'Turbo]

Any adapter that does not change the length of the torque wrench can be used and the indicated/set torque of the wrench is what is being applied to the bolt or nut, according the the operating manual that came with my Snap-on digital (Techwrench), which even has markings on the wrench indicating the length they are talking about. In other words, if one were to use an adapter (shorties, such as in the pic above, or ones much longer), it just needs to be positioned at a 90 degree angle to the torque wrench head (I think that is what Rocket is describing above)