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ESAW SW-2904 – Spiral Spring simple pendulum Ophthalmic Surgery: Cataract removal andThe ESAW Spiral Spring (SW 2904) is a closely coiled iron spring, specifically designed for the demonstration of wave motion. With ideal elasticity and strength, it provides an excellent tool for understanding wave properties in physics classrooms and laboratories. Its durable construction ensures repeated use in both academic and research settings. Use Cases: Students: Visualize and understand the fundamentals of wave propagation and mechanics.