Abstract: A torque wrench (40) with a variable-arm clicker mechanism, comprises a substantially tubular body (41), equipped with a handgrip (18) from which protrudes a ratchet gear element (4), suited for engaging with the blocking device which must be tightened. Inside the tubular body (41) is the clicker mechanism, which comprises a main lever (2) ending with the ratchet gear element (4), with fulcrum on the same tubular body (41) by means of a pin (3). The clicker mechanism has a pair of parallel intermediate levers (6), hinged on a fulcrum (10), integral with a mobile carriage (9), where the parallel intermediate levers (6) extend within the carriage (9) through slots (31, 32) which act as guides for the levers and are connected by means of a pin (12) to small levers (22) which command a push rod (20) that operates a spring (16).