The Stelometer is a precision testing instrument used to measure the strength and elongation of textile fibres. It is widely used to evaluate the possible adverse effects of fibre preparation processes and to ensure that treatments such as dyeing do not weaken or damage the fibres.

Fibre strength and elongation together determine the overall “toughness” of a fibre. Strong fibres are essential for producing durable yarn, while fibres with appropriate elongation provide flexibility and stretch to the finished fabric. These two characteristics are critical quality parameters in the yarn spinning and textile industries.

Fibre purchasers use the Stelometer to assess strength and elongation to ensure consistent raw material quality. Researchers rely on it to develop stronger and more resilient cotton, animal, and man-made fibres, while fibre manufacturers use the instrument as part of their routine production quality control procedures.