Functional Human Knee Joint Model Subcategory_Test Tubes Pairs 50mm of aperture with

Pairs 50mm of aperture with a 200mm focal length on a convex glass surface

Pan balance demonstration lever with a low-friction brass pivot

Sixty-five-piece molecular model set with 32 atoms and 33 bonds for demonstrating bonding angles

Twenty-centimeter steel helical spring paired with 2kg

and Newton's Third Law through one-dimensional elastic collisions along a 27-inch V-shaped track with five steel balls

Functional Human Knee Joint Model Subcategory_Test Tubes Pairs 50mm of aperture withFlexible joint allows the model to move through knee flexion and extension, demonstrating ligament engagement and meniscus function for sports medicine teaching.