300 x 12.5 mm
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A pack of 12 in plastic case.
Biots Apparatus for Physics Lab is a spherical conductor on insulating stand with insulated handle, to show that electrostatic charge resides on outer surface
Rod Ebonite for Physics Lab With rounded ends; 300 x 12.5 mm.
Rod Glass for Physics Lab With rounded ends; 300 x 10 mm.
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