A metering apparatus for measuring the flow of water or other fluid through a conduit. The meter comprises a measuring chamber, in which is disposed a nutating ball and disc. A unitary biaxial member, comprising a drive shaft and a spindle having a longitudinal axis offset from that of the drive shaft, couples the ball and disc to a rotating magnet. The unitary biaxial member both controls the offset of the ball and disc from horizontal, such that it nutates in response to water flow through the meter, and translates this nutation to rotation of the magnet, allowing for measurement of water volume flowing through the measuring chamber.