For one torque testing application, there are two key reasons for taking the time to carefully select a torque sensor: to prevent damage and ensure accuracy.
We could check it as following: 

• Types of torque sensors, such as reaction, circular shaft, analog telemetry, digital telemetry and dual-range torque sensors
• Application considerations, such as accuracy, capacity range, RPM rating, output requirements and response times
• Environmental considerations, such as temperature, dirt and electromagnetic interference
• Dynamic considerations, such as rotational effects, critical speeds and extraneous loading
• Physical requirements, such as size and mounting limitations of the torque sensor
• Costs or budget considerations

And we also could do it as following:
Understanding your application and defining your requirements are a crucial part of this procedure. After you’ve clearly defined your application, define what it is you want to measure, control or monitor. Do you want to measure torque? Meaning, do you want to convert a torsional mechanical input into an electrical output signal? Application examples include:

• Dynamometers
• Tool dulling indicator
• Motor control
• Inline rotating shaft feedback
• Monitoring mixer torque to meet required viscosity
• Integrated servomotor or stepping motor for further automation, feed back control and verifying regulated torque in frictionless bearings and long guide wires in medical application
• Torque wrench verification and/or calibration

Brans will do our best to support you for every torque force testing application in the near future. 
Welcome to Brans. www.bransensor.com