Calibrate Torque Wrench Without Any Special Tools - YouTube
Materials | Free Full-Text | Design of a Non-Contact Radial Torque Sensor with Variable Torque Range by Electromagnetic Coil Coupling with Piezoelectric Sensor | HTML
How to Calibrate a Torque Wrench (with Pictures) - wikiHow
Yes, you can build a DIY power meter at home ... but please don't - CyclingTips