Electrostatic charges are indicated by the deflection of a black plastic straw pivoted on a pin.The polished zinc plate on top is used to demonstrate photoelectric effect and various other electrostatic demonstrations. The metal case measures 14 cm in diameter. The scale is graduated in 10° increments in two quadrants.
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We are currently unable to calculate your contract price for this item. List price is being displayed temporarily. When your order is processed, you will be invoiced at your contract price even though list price is displayed now