US$ 19.98
sized to power electrolysis
Six-lens optics set of three double-convex and three double-concave glass lenses with ground beveled edges
Five color-coded ceramic ring magnets at 46mm diameter mount on a 15cm wooden dowel
Spare pack of ten low-mass pith balls sized for the standard pith-ball electroscope
Giant Newton's cradle at 12
Parallel and Series Circuit Demonstrator Pack Size_5 sized to power electrolysisFive bulb circuit demonstrator with 8 removable metal bars on a heavy base, letting students rearrange bars to convert between series and parallel topologies on the same set of lamps.