4-Step Differential Metal Pulley, 20/30/40/60mm Type_Tall Form supplying ten selectable values for

supplying ten selectable values for low-resistance Ohm's-law work and bridge-circuit calibration at the bench

Compact 2mm-plug connecting lead in the small-scale lead family

sized for high-turn-count windings where each turn adds little diameter to the coil core

this metal helix lets stairwell-scale wave-propagation experiments amplify the visibility of standing waves

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

4-Step Differential Metal Pulley, 20/30/40/60mm Type_Tall Form supplying ten selectable values forFour step differential pulley with 20, 30, 40, and 60mm sheaves on a 4 inch mounting rod, letting students compare force ratios across four different radii in a single assembly.