Premium Single D-Size Battery Holder with Curved Sides Physics_Alternative Energy the shared mass isolating volume

the shared mass isolating volume and density as the distinguishing variables across metals and polymers

Used to teach how AC/DC ammeters and voltmeters work

Complete 12-piece simple machines set covering inclined plane

expanding and closing to suit different optical-component sizes on a single bench-mounted holder

stabilizing the burner against accidental knocks while enabling flame adjustment

Premium Single D-Size Battery Holder with Curved Sides Physics_Alternative Energy the shared mass isolating volumeCurved side single D cell holder in premium unbreakable plastic, sized so the heavier D cell stays seated when student built circuits are picked up, tilted, or carried between stations.