Testing accessories are components used with materials testing machines to hold specimens, measure force and deformation, and control test temperatures. They are mainly used for hold specimens of different shapes securely and measure how the materials respond to tensile, compression, and other mechanical tests. Available accessories include test grips and fixtures, environmental chambers for high- and low-temperature tests, high-temperature furnaces, sensors and load cells, extensometers, and strain gauges. For reliable test results, testing accessories need to match both the material and the test method so they can hold the specimen securely, measure force and deformation accurately, and control the temperature when required.