Pith Ball Electroscope
$7.99
The SS3134 pith ball electroscope consists of an insulated brass pillar and hook on a base. It is supplied with two colored pith balls (strings attached). The pith balls become excited when brought into proximity of opposite charges.
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Reviews
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Pith Ball Electroscope
Easier to set up and demonstrate than normal flask electroscopes. Very light, very compact and works very well. I even made several sets of strings with various material standing in for the pith balls to test those different materials. All in all a great learning tool!
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Good size
Larger than most pith balls I've seen online for sale, plus a good solid stand.