Optically Worked Double Concave Glass Lens, 38mm Diameter Focal Length:50mm this 500-count pack of 125mL

this 500-count pack of 125mL amber wide-mouth HDPE bottles blocks UV light during photosensitive chemical storage

biuret reagent

this silk square gives friction rods a strong positive charge for triboelectric and electrostatic demonstrations

5-200Hz via 4mm plugs

Refill kit provides replacement materials for AP Biology investigation #6 cellular respiration with pre-measured chemicals and documentation

Optically Worked Double Concave Glass Lens, 38mm Diameter Focal Length:50mm this 500-count pack of 125mLGround and polished glass surfaces produce ray tracing quality images for demonstrating virtual image formation through diverging lenses.