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

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

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

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

Designed to recharge the cells used in laboratory apparatus

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.