Clear Interchangeable Dial for Demonstration Meter Material_PVC and a six-turn thick coil

and a six-turn thick coil for hands-on Lenz's law and induction-heating work

routing a single input between two alternative output paths to introduce circuit-control and signal-selection logic

letting students watch the wire travel along the rail as roughly 3A of current crosses the magnetic field

this 75mm metal-framed apparatus demonstrates thin-film interference and the wave nature of light

and spectral-line work

Clear Interchangeable Dial for Demonstration Meter Material_PVC and a six-turn thick coilUsed in laboratory apparatus that needs interchangeable rotary scale indicators, this clear dial provides a readable face for measuring angular displacement in physics setups.