Electric ratchet wrench

An electric ratchet wrench comprising:

• a tool head unit;
• a wrench body unit that extends along a first axis, and that includes a main body portion and an installation portion connected between said tool head unit and said main body portion;
• an output unit that includes a head driver mounted on said tool head unit, extending along a second axis that is transverse to the first axis, and being configured to rotate in a selected direction and output rotational energy;
• an electric unit that is mounted in said installation portion, and that is operable for driving rotation of said head driver;
• and
• a sensor unit that includes
• a transmitting handle pivotably connected to said main body portion, and
• at least one sensor module disposed between said main body portion and said transmitting handle;
• wherein, when said transmitting handle is driven by an external force to pivot relative to said main body portion, said sensor module outputs a torque reading of the external force.