US$ 25.00
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Compact 150mm black 4mm-stackable lead with nickel-plated split-hollow pins
and 50mm wheel diameters in open-sided frames
Conversion chart for SWG/AWG/Inches:
Heavy-gauge steel inclined plane with built-in vertical
Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Science at Home_Life Science sodium benzoatePlano cylindrical lens at 50 by 50mm with 17 diopter optical power and ground polished edges, the cylindrical curvature focusing light to a line rather than a point in optics demos.
US$ 25.00
US$ 12.00
US$ 10.00
US$ 15.00
US$ 10.00
US$ 10.00
US$ 15.00
US$ 15.00
US$ 59.99