The Deflection of Beams Apparatus is a bench-mounted testing unit designed for studying the deflection behavior of beams under various loading and support conditions. The apparatus enables students and researchers to investigate the effects of beam length, material properties (Young’s modulus), moment of inertia (I-value), and different support types (cantilever, fixed, simply supported, and propped cantilever) on deflection. The main structure is made from aluminum extrusions, ensuring durability and precision. A twin-beam setup, with beams measuring at least 1140mm long and 40 × 16 mm in section, is mounted on legs 250mm wide × 250mm high. The apparatus includes adjustable screw feet for proper leveling and a 1-meter scale for accurate measurements. The system comes with two knife-edge supports, one built-in support, and three stirrups with 1N load hangers, providing flexibility in experimental setups. Deflections are measured using two high-precision dial gauges (0-12 mm, 0.01 mm resolution) mounted on a support unit. A slope indicator with a clamp allows for additional angular measurements. Load application is facilitated with a load position indicator to ensure precise placement of weights. The unit includes a set of beams in various materials, such as steel, brass, and aluminum, allowing users to study the influence of material properties on beam behavior. The entire system is conveniently stored in a dedicated storage tray to keep all components organized and protected.