An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical handmade mechanical instruments to high-precision electronic devices. Modern electrometers based on vacuum tube or solid-state technology can be used to make voltage and charge measurements with very low leakage currents, down to 1 femtoampere. A simpler but related instrument, the electroscope, works on similar principles but only indicates the relative magnitudes of voltages or charges. https://en.wikipedia.org/wiki/Electrometer

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Schauberger
All birth requires fertilisation. Fertilisation, however, necessitates the disintegration of the original ur-form. All of which brings us to the fundamental question: What actually is motion? This question is answered by a free-falling droplet of water, from which a horizontally and vertically radiating energy-form springs forth, the power of the horizontal emission corresponding to about 12,000 seed-volts as measured with an electrometer. These are referred to as seed-volts here, because in this case we are concerned with a charge-bundle which contains about 12,000 water embryos in an energetic state. These are freed when a drop of water merely falls about 20 cm (8 inches). Naturally, special equipment is required to measure this capacity. To describe it in more detail here, would stray too far from the present theme, therefore clarification of the 'essentials' will have to suffice. [The Energy Evolution - Harnessing Free Energy from Nature, The Ennoblement of Water]

this energy-form is conducted into a glass bulb super-saturated with air containing oxygen, then about the same number of water-droplets appear as the seed-volts measured on the electrometer. With this we are already presented with the birth of water and the form of motion that induces it. [The Energy Evolution - Harnessing Free Energy from Nature, The Ennoblement of Water]