PTFE Replacement Burette Stopcock Plunger, 3 5/16 inch Science at Home_Chemical Science Acrylic double-concave lens at 86mm

Acrylic double-concave lens at 86mm length and 20cm diverging focal length

the diverging curvature delivering reduced virtual images while the larger face brightens viewing

Numbered hand-painted cecum model highlights the ileocecal valve and pouch structure at the junction of small and large intestine for digestive anatomy teaching

relating photon frequency to the kinetic energy of emitted electrons for quantum physics investigations

PTFE Replacement Burette Stopcock Plunger, 3 5/16 inch Science at Home_Chemical Science Acrylic double-concave lens at 86mmPTFE replacement burette stopcock plunger measures 3 5 16 inches from end for chemical resistance in titration and volumetric analysis procedures.