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nounmeter to measure electrostatic voltage differences; draws no current from the sourcetype of:
Words sounding like good electrometer
barometer electrometer radiometer chronometer spectrometer speedometer manometer densitometer odometer pedometer micrometer fathometer dynamometer magnetometer tachometer sphygmomanometer anemometer tacheometer disk photometer prism spectrometer milometer psychrometer half chronometer actinometer pocket chronometer mass spectrometer electronic chronometer sclerometer marine barometer precision barometer