Indicating Torque Wrenches

Type I – shows the applied torque value via a mechanical scale, a dial gauge or an electronic display ("test spanner" or "measuring spanner"). The following variants can be encountered:

• Direct-reading torque wrench (aka "pointer spanner" and "clock spanner")
  - Simplest form with bending beam lever
  - Tightening value is directly indicated by a mechanical scale or dial gauge
  - Application of force must be stopped by the user

• Electronic torque wrench
  - Target value is preset
  - Reaching the set value triggers a signal (audible, visual)
  - Application of force must be stopped by user
  - Suitable for documentation purposes

• Electronic torque/angle wrench
  - Target value is preset
  - Supplementary measurement of the angle of rotation
  - Reaching the set value triggers a signal (audible, visual)
  - Application of force must be stopped by user
  - Suitable for documentation purposes

• Mechatronic torque wrench
  - Target value is preset
  - Reaching the set value triggers a signal (audible, visual, tactile)
  - Mechanical and digital measurement
  - Application of force must be stopped by user
  - Suitable for documentation purposes