Process Control Devices offers a series of variable area flow meters. Designed to measures the flow rate of a fluid flowing through vertical pipelines. Acrylic body rotameter is economical and suitable for low flow rate indication for fluids.

A rotameter consists of a tapered tube, typically made of glass with a 'float' (a shaped weight, made either of anodized aluminum or a ceramic), inside that is pushed up by the drag force of the flow and pulled down by gravity.