Measuring instruments for measuring strain; strain gauges; load cells for measuring load and weight; electrical transducers for measuring physical quantities such as displacement, pressure, acceleration, load, compression, torque, friction, temperature, force and vibration by converting into electrical output; switch boxes; electronic data loggers; downloadable computer software for reading, storing, analyzing data related to strain measurement; torque meters; telecommunication apparatus for transmitting data acquired by strain measurement; accelerometers; amplifiers; electric cables and wires; junction boxes; calibrators for checking whether measuring instruments and devices are operating normally and accurately, within the measurement range; telemeters; digital indicators for displaying a measured value on the display part of the instrument; FBG interrogators