Obtain quantitative data for electrostatic experiments

This useful coulomb meter behaves similar to a digital electroscope. Its display shows the number of coulombs deposited into it by a current through a resistance; or from a capacitor; or from a source of static electricity, like a charged plastic rod. While an electroscope will deflect its vane, this instrument digitally displays the charge in Coulombs up to 1.999 nanoCoulombs. Requires one 9V battery, not included.