US$ 70.66
1 inches) with red/blue pole markings and steel keepers
regenerative braking with motor-generator #2
this large earthworm dissection model reveals segmentation
Six-lens optics set of three double-convex and three double-concave glass lenses with ground beveled edges
Zinc-plated rectangular steel bar-magnet pair packaged with keepers that bridge the poles in storage
Resistance Investigation Board Type_Round End 1 inches) with red/blue poleCompact 42 cm resistance investigation board, the lower cost benchtop alternative to the full meter resistivity boards for quantitative R = rho*L A and material comparison investigations.