Bar Magnet Support Stand, 4.5", for 3/4" Wide Magnets Material_Polyethylene Square-topped wooden screw simple-machine model

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

Adjustable mass on one fork shifts its 440Hz pitch by a few hertz

with AC and DC both available on separate terminals for electronics builds

and nucleus out of the cell body for hands-on organelle identification in cell biology teaching

Bare 20 SWG copper wire on a 250g reel approximating 140 feet

Bar Magnet Support Stand, 4.5", for 3/4" Wide Magnets Material_Polyethylene Square-topped wooden screw simple-machine modelPlastic holder atop a 4. 5 inch needle pointed stand grips a 3 4 inch wide bar magnet upright for hands free study of attraction, repulsion, and torsional balance.