gaasi mahumõõtur, milles mõõtmiseks eraldatud osa on kujundatud püsikambri ja pöörleva(te) elemen(di)tide abil, gas volume meter in which a rigid measuring compartment is formed between the walls of a stationary chamber and rotating element or elements, meter in which the measuring chamber is formed between the walls of a stationary chamber and an element (or elements) which is (are) rotated by the fluid flow, arvesti, mille mõõtekamber on moodustatud statsionaarse kambri seinte ja vedelikuvoo poolt pöörleva(te) elemendi(te) vahel