The YF-S401 Water Flow Meter Sensor is a compact inline flow sensor with a G1/8" threaded connection, designed to measure and monitor the movement of water through a small pipe or tube. As water passes through, it spins an internal rotor that generates pulses, letting a microcontroller or flow display read how much water is flowing. It is a popular choice for home gardeners, hobbyists, hydroponics builders, and anyone putting together a small water-monitoring or automated irrigation project.
Key features
- YF-S401 model with a standard G1/8" threaded fitting for easy inline connection.
- Compact size that fits neatly into small-diameter tubing and tight setups.
- Pulse-output design that works smoothly with common microcontrollers and flow meters.
- Simple to install and well suited to low-pressure water lines.
Typical uses
- Measuring water flow in drip and small-scale garden irrigation.
- Hydroponics and indoor growing systems that need flow feedback.
- DIY automation, smart-watering, and Arduino-style monitoring projects.
How to choose / tips
- Confirm the G1/8" thread matches your tubing or adapter before ordering.
- Mount it inline following the flow-direction arrow on the body.
- Best used on clean water and low-pressure lines for steady, reliable readings.
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