This item is a concrete test hammer, specifically identifiable as a Sclerometro Fervi S110 based on the provided context.
Function: It is a non-destructive testing (NDT) device used to estimate the compressive strength of hardened concrete.
Operating Principle: It works by measuring the rebound distance of a spring-driven mass after it impacts a concrete surface; higher rebound values generally indicate higher surface hardness and compressive strength.
Features: This mechanical analog model includes a calibrated scale for direct reading and typically comes with a carrying case and accessories.
Application: It is commonly used for quick quality control on-site for bridges, tunnels, and buildings.