Lens Holder for 50mm Lens with 8mm Rod Attachment Item Type_Labware Pack of 10 Stoddard test

Pack of 10 Stoddard test tube clamps in stainless steel with finger grip securely holds test tubes during heating

supporting both rheostat and potentiometer use

Designed for science experiments but can also be used in heaters and electrical appliances

where colored liquid in a U-shaped section shifts measurably as air blown through a constricted glass tube creates pressure differences

Lens Holder for 50mm Lens with 8mm Rod Attachment Item Type_Labware Pack of 10 Stoddard test8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical bench rail for repeatable refraction, focal length, and image formation experiments.