正位移和多射流流量计通常用于类似的应用，但设计和使用的基本测量原理非常不同。有两种类型的正位移计，章动盘和摆动活塞。多喷嘴流量计是一种“无间道”流量计。其他类型的无间道流量计有涡轮机、急流流量计和螺旋桨流量计。给出了仪表的描述、设计特点、选择和应用标准。

Positive displacement and multi-jet meters are often used in similar applications but the designs and the basic measuring principles used are very different. There are two types of positive displacement meters, nutating disc and oscillating pistons. Multi-jet meters are a type of "inferrential" meter. Other types of inferrential meters are turbines, torrents and propeller meters. Descriptions of the meters, design characteristics, and selection and application criteria are given.