Force sensor for Mechanical leg

I need a force sensor for a steel cable. I need to attach a steel cable to both sides of this device and it needs to tell me the force it is being pulled by. Does anyone know what sensor this would be?

I am making a device that uses actuator attached to a rope which then activates according to a force on the actuator. I was thinking of using the current or voltage effect of the motor itself when force is applied to it. Any ideas would be helpful, thanks.

You don't say anything about size or force being measured, Google "crane strain gauge", here's one link:

check out omega engineering or chattillon the best type would be the "S" shape load cell there are shields for arduino to measure force CRobotix has several options