A line­side torque analyser for pro­duc­tion pow­er tools, it pro­vides high­ly accu­rate mea­sure­ment both clock­wise or anti clock­wise, as well as hand tools if required, and incor­po­rates an inte­grat­ed screen and sen­sor. It is portable enough to be used as part of a mobile cal­i­bra­tion cen­tre and robust enough to be used in a pro­duc­tion environment.