Clear Interchangeable Dial for Demonstration Meter Material_PVC Meter-stick optical bench fitted with

Meter-stick optical bench fitted with two supports

Alnico Grade III bar pair at 75 x 15mm with steel keepers in a cardboard box

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

and spectral-line work

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

Clear Interchangeable Dial for Demonstration Meter Material_PVC Meter-stick optical bench fitted withUsed in laboratory apparatus that needs interchangeable rotary scale indicators, this clear dial provides a readable face for measuring angular displacement in physics setups.