S: (n) electrometer (meter to measure electrostatic voltage differences; draws no current from the source)
S: (n) fluxmeter (meter that measures magnetic flux by the current it generates in a coil)
S: (n) galvanometer (meter for detecting or comparing or measuring small electric currents)
S: (n) astatic galvanometer (has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field)
S: (n) moving-coil galvanometer (a galvanometer that is operated by the force exerted by an electric current flowing in a movable coil suspended in a magnetic field)
S: (n) Rayleigh disk (an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity)