GREDIA 3/8" Quick Connect Water Flow Sensor Food-grade Switch Hall Effect Flowmeter Fluid Meter Counter 0.3-10L/min

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 would not use this for anything where you need a reliable measurement. Initially worked great (with filtered water) but within 2 months it measured much lower flow rate than the actual flow. Seems the turbine doesn't always spin fast enough, allowing water to pass over it without being counted.

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"

The rotary blades used within this hall effect flowmeter are tapered such that they have a variable width. Because of this, water can easily pass through gaps between these blades and the flowmeter casing which basically renders flow data as garbage. Digiten also utilizes this completely useless design. Do not buy from either of these companies

Description says package of 2.I only received one.Still no response.