Fidget Spinner Tabletop Desk Stand and Holder Lab Supplies_Weights & Masses running battery-free for repeatable classroom

running battery-free for repeatable classroom and stockroom use

supplied with a rubber seal for bell-jar vacuum demonstrations

Twelve-spring steel extension set paired across six size combinations with looped ends

Demonstrates eddy-current braking as circular magnets swing over a 4

a step up from the 70mm model with extended pole separation that gives field-mapping experiments more room along the magnet axis

Fidget Spinner Tabletop Desk Stand and Holder Lab Supplies_Weights & Masses running battery-free for repeatable classroomTabletop desk stand displays fidget spinners upright for organized desk presentation during fidget toy collection and rotation.