Ultrasonic measuring equipment from Elster-Instromet work on the run-time principle, in other words they use the fact that ultrasonic pulses move more quickly in flow direction than against the direction of flow. The use of the latest technologies allows very small time differences to be detected, in other words even very small volumes can be registered accurately. Patented measuring path layouts ensure that not only the axial velocity, but also torsional force and other profile components can be recorded. This allows installation effects in the unit to be given a great deal of consideration so that they do not have to be compensated by having very long straight pipelines. The product range includes ultrasonic gas meters for custody and non-custody transfer measurements, for diameters from 3? to 48? and pressure ratings of up to ANSI 900 as standard. Equipment with other characteristic data is available on request.