Specialized testing equipment category for evaluating fatigue characteristics of materials and components. Equipment group that measures fatigue life, fatigue strength, and crack propagation characteristics of metals, resins, composite materials under repeated loading. Includes rotating bending fatigue testing machines, axial load fatigue testing machines, high-frequency fatigue testing machines, thermal fatigue testing machines, essential for durability evaluation of automotive parts, aircraft components, and mechanical parts. Capable of testing in compliance with standards such as JIS Z 2273, ASTM D7791, directly linked to reliability assurance and quality guarantee in product design stages. Unlike general strength testing machines or hardness testers, specializes in evaluating material deterioration under long-term repeated loading.