1 G (100 μT) resolution; the electron beam is electrostatically centered between two anodes while no magnetic field is present; the magnetic field to be detected will then deflect the beam more towards one of the anodes, resulting in an imbalance between the two anode currents E1T - Trochotron with a fluorescent-screen readout QK329 - Square-law tube for use as a function generator in analog computers.