Abstract: A low-cost fluid flow meter to conveniently measure the volume of a fluid, for example water, when expelled from a faucet is disclosed. The device is simple to install and requires no user interaction or electric power to operate. The device includes a scale with markings for predetermined volumes of a fluid. A flow divider is used to redirect a small portion of the fluid flow into a separate measurement compartment. The fluid level is then registered optically and presented through light-guiding optics to the user. The measurement compartment is automatically emptied through a pressure activated reset mechanism, so that when fluid flow is turned off the meter is nulled. The device can serve as a direct replacement for many of the common measurement sets and containers used in a household for water dosage. In this setting water spoilage is reduced and water consumption awareness is increased.