Round Bug Viewer with 4X Magnifier Lid Waves & Oscillation_Sound & Resonance letting students compare four densities

letting students compare four densities by mass alone while the volume is held constant across the set

Selenium photovoltaic cell on a 4 by 3 by 1

Long-focal double-convex glass lens at 75mm diameter and 250mm focal length

Round convex glass mirror for physics optics experiments in reflection

Heavy 150 x 25 x 15mm Alnico U-shape with clearly marked poles and a keeper bar

Round Bug Viewer with 4X Magnifier Lid Waves & Oscillation_Sound & Resonance letting students compare four densitiesClear magnifier lid on this round viewer captures and enlarges small insects or specimens for elementary and middle school entomology observation.