12-Piece Density Metals Variety Set with Assorted Shapes Material_PVC Length-adjustable wooden pendulum simple-machine model

Length-adjustable wooden pendulum simple-machine model with a blue bob sliding along the string and a wooden guide keeping the swing on a consistent path for period-vs-length measurements

diverting a calibrated portion of bench-supply current around the meter coil so the galvanometer reads heavier loads safely

each one rotating to follow the local field whenever a magnet is placed beneath the plate or alongside it

Miniature desktop torso with 12 removable parts includes a dissectable head and brain for compact classroom anatomy and biology teaching

12-Piece Density Metals Variety Set with Assorted Shapes Material_PVC Length-adjustable wooden pendulum simple-machine modelAssorted shape density kit with 12 specimens across brass, iron, aluminum, copper, zinc, and lead, each 12 25g, giving students shape variation on top of the material density comparison.