Positive displacement meters are devices used to measure the flow of liquids or gases by capturing a fixed volume of the substance with each cycle. As the fluid moves through the meter, it fills and empties a chamber, allowing for accurate measurement of the total volume that has passed through. This type of meter is commonly used in applications where precise measurement is essential, such as in water supply systems or fuel dispensing. These meters are known for their reliability and accuracy, making them suitable for various industries, including oil and gas and chemical processing. They can handle a wide range of flow rates and are less affected by changes in pressure or temperature compared to other types of flow meters.