5-Piece Low-Friction Double-Tandem Plastic Pulley Set, 38 and 50mm Plastic Labware_Plastic Measuring Cylinders with banana-plug terminals for optical-bench

with banana-plug terminals for optical-bench and physics-demonstration circuit setups

Sturdy wooden pulley simple-machine model with multiple pulleys mounted in series and parallel

and grease splashes across the torso in a 27 by 30 inch rubberized vinyl apron

Stabilizer-free Bunsen burner runs on natural gas for routine heating in chemistry and biology classroom laboratories

holding a 20mm candle steady for thermal-expansion

5-Piece Low-Friction Double-Tandem Plastic Pulley Set, 38 and 50mm Plastic Labware_Plastic Measuring Cylinders with banana-plug terminals for optical-benchFive pulley set of tandem 38mm 50mm low friction plastic pulleys on open sided frames, equipping a class for dual diameter compound pulley experiments without cord threading setup.