6-Piece Acrylic Lens Set, 50mm (Convex, Concave, Plano, Meniscus) Subcategory_Lab Burners Ten-pack of 5mm yellow LEDs

Ten-pack of 5mm yellow LEDs with diffused round lenses

Hangs a 20mm solid aluminum cube via an integrated hook for water-displacement density work

Copper plate with 4mm socket terminals for the simple-cell apparatus

Beech wood test tube rack holds 12 tubes up to 20mm diameter in a 9-inch frame for organized storage during chemistry and biology experiments

and permittivity

6-Piece Acrylic Lens Set, 50mm (Convex, Concave, Plano, Meniscus) Subcategory_Lab Burners Ten-pack of 5mm yellow LEDsDesigned for safer per desk optics, a 50mm six piece acrylic lens set covers double convex, double concave, plano convex, converging meniscus, diverging meniscus, and plano concave.