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rubber grommet
and comparisons
Premium Quality: Electromagnetic U-form is made of high-grade construction all the way through
These double-sided
making it possible to view the magnetic field from all angles
Electroscope Pointer Flasks rubber grommetBig demonstration Electroscope, the whole class can see the deflection. Strong metal construction, 6. 75 inch Diameter, total height 10. 5 inch. Transparent front glass plate, translucent back plate so that repulsion can easily be observed. Graduated back glass to compare charges with terminal for earthing. Premium Quality: Electroscope Pointer is made of high grade construction all the way through, excellent build quality and proven reliability
