A portable Thermal Effusivity Meter for the Measurement of Textiles, Fabrics, and Solids. TPS-EFF uses a single-sided TPS sensor along with 2 and 10 second test times to fully understand measurement of comfort with touch time.

Thermal Effusivity (W√s/m²K) is described as a materials ability to exchange heat with its surroundings. Surface haptics is a branch of psychology, describing the sense of touch, localized to the skin surface. The feeling of warmth and coolness (thermal effusivity) makes up the feeling of comfort, or the desired effect, which goes into the touched material surface. This is an important field of measurement for textiles, fabrics and solids.

The TPS-EFF (Transient Plane Source-EFFusivity) is a portable meter for direct determination of thermal effusivity of textiles and other low effusivity materials, in accordance with ASTM D7984-16. With a single measurement of 2 or 10 seconds in duration, materials can be accurately measured for thermal effusivity.