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 135-piece biochemistry student set ships in a 4-compartment case for organized building between lessons

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

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

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.