A liquid measurement system including interface apparatus for sharing the excitation and signal processing of an ultrasonic transonic transducer and temperature measuring device remotely located at a liquid container is disclosed. Each airfoil includes opposite pressure and suction sides and extends in chord between opposite leading and trailing edges. 0 mol %, and silver bromide content of 0. The work piece is positioned on the mandrel, which is free to roll by gravity on rails which cooperate with the wheels to self-align the travel of the carrier. Methods of delivering an aerosol formulation using a device comprising the novel metering valve are also disclosed.