Blue Epoxy Wire Test Tube Rack, 40-Hole (4 x 10), for 20-22mm Tubes Material_Nylon inner diameter measures 9mm

inner diameter measures 9mm

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

panel-mounted with 4mm sockets and an enclosed earth connection for safe wiring during induction and AC demonstrations

and vascular bundles for plant anatomy and photosynthesis teaching

forming a half-meter square for ecological field sampling and population-count fieldwork

Blue Epoxy Wire Test Tube Rack, 40-Hole (4 x 10), for 20-22mm Tubes Material_Nylon inner diameter measures 9mmBlue 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.