Blue Epoxy Wire Test Tube Rack, 40-Hole (4 x 10), for 20-22mm Tubes Material_Nylon exposing the moving parts so

exposing the moving parts so students see directly how a DC current drives a rotating magnetic field

and colon for classroom digestion teaching

this simplified plant mitosis model presents prophase through telophase with hand-painted stage-by-stage detail

the curved-face geometry letting beams enter along any radius for clean Snell's law angle work in ray-box and refraction setups

the lightest option in the series for mass-dependent period-comparison experiments

Blue Epoxy Wire Test Tube Rack, 40-Hole (4 x 10), for 20-22mm Tubes Material_Nylon exposing the moving parts soBlue epoxy coated steel wire test tube rack with 40 holes in a 4 by 10 layout, sized for 20 to 22 mm tubes and resistant to lab reagent splashes on classroom benches.