Optically Worked Double Convex Glass Lens, 38mm Diameter Material_Plastisol Polymer demonstrating atmospheric pressure as the

demonstrating atmospheric pressure as the can implodes under evacuation

sized as a generic spare in the PH1118 demonstration-meter scale series for swap-in classroom use

and biliary anatomy in a compact 7 x 5 inch display format

quartz is useful during lessons on mineral hardness

letting students sweep resistance from zero to maximum to watch a circuit's current and brightness respond in real time

Optically Worked Double Convex Glass Lens, 38mm Diameter Material_Plastisol Polymer demonstrating atmospheric pressure as theSpherical double convex lens made from optically worked glass with polished faces and ground edges, used to demonstrate light convergence and image formation.