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.

This works great interfacing worh Arduino. The price can be lowered a bit for the size of the product and considering it's foreign made. Interfacing with Arduino and writing the correct program gave me very good accuracy in the volumetric displacement measurements that I was taking for a RO water system efficiency test.

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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