We have adapted a classical nonresonance method to measure the magnetic susceptibility of liquid3He at low temperature. With modern instrumentation the method has sufficient sensitivity to measure the nuclear susceptibility and nuclear relaxation time of3He. The technique is based on the fact that for two locations on the free surface of a liquid in equilibrium, the height difference is given by h2−h1= &khgr;(H22−H21)/2g, where H2and H1are the local values of the magnetic field at the liquid surface, &khgr; is the magnetic susceptibility per unit mass, and g the acceleration of gravity. Change in the liquid level between closely spaced parallel electrodes changes their capacitance, which is used to obtain h2−h1. Differences in &khgr; as small as 10−10emu/gm were easily detected in these measurements. The method can be applied to other weakly magnetic liquids and, in modified form, to solids.