Berger connected these sensors to a Lippmann capillary electrometer, with disappointing results.
From the en.wikipedia.org
The pyroelectric currents and the dc resistivity of the samples were determined with an electrometer.
From the nature.com
As a recording device he first used the Lippmann's capillary electrometer, but results were disappointing.
From the en.wikipedia.org
His electrocardiograph machine consisted of a Lippmann capillary electrometer fixed to a projector.
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He also adapted the Lippmann's capillary electrometer in order to use it for measuring subtle bioelectrical phenomena.
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In 1872, Righi's electrometer was developed and was one of the first antecedents of the Van de Graaff generator.
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Among the many devices he invented, are in the electrometer quadrant and a double refractometer great precision.
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Thomson constructed a Crookes tube with an electrometer set to one side, out of the direct path of the cathode rays.
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Thomson observed that the electrometer registered a charge only when he deflected the cathode ray to it with a magnet.
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More examples
Meter to measure electrostatic voltage differences; draws no current from the source
An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical hand-made mechanical instruments to high-precision electronic devices. ...