Round Convex Glass Mirror, 75mm Diameter, 75mm Focal Length Capacity_17mL the lower-cost benchtop alternative to

the lower-cost benchtop alternative to the full-meter resistivity boards for quantitative R = rho*L/A and material-comparison investigations

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

Magnetic-base pulley with a 50mm ball-bearing plastic wheel

producing a smaller flame footprint suited to individual student work on crowded benches

Round Convex Glass Mirror, 75mm Diameter, 75mm Focal Length Capacity_17mL the lower-cost benchtop alternative toDesigned for divergence demos at scale, a 75mm aperture convex glass mirror at 75mm focal length and ~2. 8mm thickness produces reduced virtual images with a notably widened apparent field.