12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science this bottle of coarse 20-mesh

this bottle of coarse 20-mesh iron filings is a staple for classroom magnetism and field-pattern demonstrations

Large-format Boyle's Law apparatus with hand pump

Square-topped wooden screw simple-machine model with a leverage block

paired with the 750mm black lead to keep wiring color-coded across mid-distance bench setups

12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science this bottle of coarse 20-meshPlug 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.