Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single Selected through four rotary-switch decades

Selected through four rotary-switch decades from 0 to 11

Enlarged mandible model exposes lower jaw teeth

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

supplying a hands-on teaching tool for atomic and molecular orbital visualization in introductory and advanced chemistry

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single Selected through four rotary-switch decadesConcave glass mirror, 50mm diameter and 150mm focal length, the f 3 curvature stretching the focal throw for demos that need the focal point set comfortably beyond the mirror face.