electrometer
Concise Oxford English Dictionary © 2008 Oxford University Press:
electrometer /ˌɪlɛkˈtrɒmɪtə/
▶noun Physics an instrument for measuring electrical potential without drawing any current from the circuit.
– derivatives
electrometric adjective,
electrometry noun.
electrometric adjective,
electrometry noun.
'electrometer' also found in these Oxford entries:

