What mechanism do digital indicator manual torque wrenches use to measure applied force?

Digital indicator manual torque wrenches utilize a strain gauge attached to a spring to measure the applied force. When torque is applied to the wrench, the spring experiences deformation. The strain gauge detects this deformation, and based on the amount of change, it calculates the amount of torque being applied. This mechanism allows for a precise measurement of force, which is critical in aerospace applications where exact specifications must be adhered to in order to ensure safety and performance.

By using a strain gauge, these wrenches can accurately gauge the force due to the direct relationship between the force applied and the deformation of the spring. The digital display then interprets the readings from the strain gauge and presents the torque value to the user, allowing for easy verification of the applied torque level. This method of measurement is widely accepted for its reliability and accuracy, particularly in fields that demand high precision.