1/4" Quick Connect Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 0.3-6L/min

They work well and have been reliable and repeatable so far. I am using them on a keg level monitoring system. I found I can drill-out the input side (take apart the sensor first!) with a 1/8" drill bit and get less breakout (less foam) with minimal impact on the repeatability of pours. The K-factor drops from about 4600 to 2800 but that is still plenty of resolution for this system.

I use it to sense the water flow of my RO system and trigger the UV light to sanitize the water. It worked as expected no complains.

I use it to track usage/flow rates for my RO unit. . Connected to a ESP8266 & works fine with 3.3v supply .. simply connect it directly to a GPIO pin. Programmed the ESP8266 using ESPhome & use InfuxDB to store the data, Grafana to display. For example, to measure L/hr configure ESPhome as follows: - platform: pulse_counter pin: GPIO5 name: "Pulse Counter" update_interval: 60s filters: - lambda: return (x / 38.0) * 60.0; unit_of_measurement: "L/hr"

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