Classification of specialized equipment and devices for measuring and evaluating thermal properties of materials and products. Includes thermal conductivity meters, thermal expansion measurement devices, differential scanning calorimeters (DSC), thermogravimetric analyzers (TGA), thermomechanical analyzers (TMA), and others. These measurement instrument groups are used in manufacturing industries for material development, quality control, and product design to quantitatively evaluate thermal properties such as heat resistance, thermal stability, and thermal deformation characteristics, contributing to product reliability improvement and new material development.