Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Included_Rod & Base & Clamps the smallest in the Alnico

the smallest in the Alnico horseshoe series and well sized for individual student handling during basic attraction-and-repulsion lessons

waterproof

Available in 13mm

this demonstration electroscope detects and visually quantifies the magnitude of static charges

six steel wires carrying 20 beads each for hands-on instruction in counting

Double Concave Glass Lens, 50mm Diameter, 300-1000mm Focal Length Range Included_Rod & Base & Clamps the smallest in the AlnicoRange rated 50mm double concave glass lens spanning 300 1000mm focal lengths, ground polished edges and optically worked surfaces giving long bench divergence flexibility in refraction work.