Hardness Testing using the UCI and Rebound methods provides a non-destructive way to measure the hardness of metals. The UCI method employs ultrasonic vibrations with a diamond tip, while the Rebound method measures the rebound velocity of an impact body on the material surface. These techniques are ideal for field inspections, offering quick, portable, and wide-area testing. Hardness testing helps evaluate the mechanical properties of materials, ensuring they meet service requirements and maintaining safety in industrial operations.