ElectroMagnet

Powered by (4) 'C' batteries, it can lift objects up to 100lbs.

• Lifts up to 100lbs.
• Powered by (4) 'C' batteries

Optical Glass Lens Set, 6 Lenses - 3 Double Convex, 3 Double Concave - 38mm Diameter - 20, 30, 50cm Focal Lengths. (3) Double Concave -20,30,50cm Focal Length, (3) Double Convex - 20,30,50cm Focal Length. This lens set is perfect for doing optical experiments comparing focal lengths and convex vs. concave lenses.