US$ 22.72
large and small helical springs
exposing the rotating coil and field magnet for direct observation as students supply 4-9V to drive the rotation
trigonal-planar
Ten-pack of 6V flash-lamp bulbs on E10 miniature Edison screw bases
75-inch plano-convex lenses in an aluminum frame
Hardwood Herbarium Press with Buckle Straps Weight_250g large and small helical springsHardwood herbarium press frame with buckle straps for drying and preserving plant specimens, sized for classroom collections and field botany projects.
US$ 22.72
US$ 79.99
US$ 14.66
US$ 163.00
US$ 149.33