12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science Large-format Boyle's Law apparatus with

Large-format Boyle's Law apparatus with hand pump

Red-coated Alnico cylindrical pair at 50 x 10mm

and magnetic strength relationships

Tandem double plastic pulley pairing 38mm and 50mm low-friction wheels on an open-sided steel frame

this 80mm steel needle in a 6mm rod doubles as a precise alignment reference for image-formation and ray-tracing setups

12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science Large-format Boyle's Law apparatus withPlug to clip 12 inch black lead combining a 4mm banana plug at one end with an alligator clip at the other, bridging instrument panels to bare wire components without rewiring.