I'm not certain, but I think most electronic torque wrenches use strain
gauges. They can just bond a strain gauge to the side of a metal rod that
is experiencing the torque (such as a part of the wrench) and the strain
gauge measures how much the metal is twisting. In fact, Cornell has a basic
mechanical engineering design course where this is one of the projects they
do (make your own simple torque wrench with electronic measurement capability).

Sean

At 07:58 AM 3/18/2003 -0600, you wrote:
>Do any of you know how this works?   Specifically what kind of sensor is it
>using down at the ratchet adaptor?
>
>
>thanks
>
>
>
>http://www.sears.com/sr/product/summary/productsummary.jsp?BV_SessionID=@@@@1893424601.1047995600@@@@&BV_EngineID=cccgadchkljhmkjcehgcemgdffmdflk.0&vertical=SEARS&pid=00944598000&sid=I0008300030000100085
>
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