Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter Right-angle cone to flexible tubing

Right-angle cone to flexible tubing Rotaflow stopcock in borosilicate glass connects ground joint apparatus to rubber tubing with flow control

Used to enclose dry cells safely for student-built circuits

Acid-base neutralization kit provides materials for pH chemistry investigations

this plug-type resistance box lets students see the switching action of each decade

Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter Right-angle cone to flexible tubingAlternate model 75mm double concave glass lens at 300mm focal length, parallel build to the main line 300mm focal model with ground polished edges for replacement or backup inventory.