9V I-Type Battery Snap Connector with Insulated Leads, 6" Physics_Mechanics this Melde's vibrating string apparatus

this Melde's vibrating string apparatus pairs an oscillator-driven string with a mass tray that adjusts tension to determine wavelength

and connecting leads mounted on 4mm-socketed bases for building circuits from 40-plus components

Six-piece laboratory-glass barware set bundles beaker shot glasses

providing the standard mid-range value for current-limiting LEDs and dropping resistors in student circuits

9V I-Type Battery Snap Connector with Insulated Leads, 6" Physics_Mechanics this Melde's vibrating string apparatusInsulated I type 9V battery snap with 6 inch red and black leads, sized for short run student wiring of buzzers, LEDs, and small motor circuits without bare terminal hazards.