Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Suspends a 20mm solid brass

Suspends a 20mm solid brass cube from spring scales for Archimedes'-principle and buoyancy measurement

Liquid propane Bunsen burner adds a flame stabilizer and adjustable air vent for consistent

and internal organelles for detailed protist biology teaching

Wooden fulcrum-balance simple-machine model with a sliding pivot

front and rear O2 sensors

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Suspends a 20mm solid brassConvex glass mirror at 75mm diameter and 200mm focal length, ~3. 1mm thick, the longer focal value softening divergence and producing a wider apparent field through reduced virtual reflections.