How do you know when the correct torque value is reached on a micrometer torque wrench?

A micrometer torque wrench is designed to apply a specific torque to a fastener, and it provides a clear indicator when the set torque value has been reached. The audible click that is heard when the correct torque is achieved serves as a reliable signal to the user. This mechanism is built into the wrench to ensure that the user does not apply excessive force, which could damage the fastener or the materials being joined.

The audible click is accompanied by a slight release of the handle, which provides tactile feedback as well. This helps the user confirm that the desired torque has been applied accurately, ensuring that components are properly secured without being over-tightened.

Considering the other options, the idea of the wrench becoming hot is not a reliable indicator of achieving the correct torque and could instead suggest excessive friction or misuse. The option involving a display is relevant for electronic or digital torque wrenches but not for traditional micrometer torque wrenches, which typically rely on sound and feel instead of a visual readout. Finally, observing that the wrench appears fully extended does not provide any actual assurance of achieving the correct torque value. Instead, this can lead to misapplication of torque if not coupled with an accurate measuring mechanism.