2Pcs YF-S201C DC3.5-24V G1/2" Transparent Flow Sensor Turbine Flowmeter Water Flow Sensor Transparent Water Flow Meter YF-S201C Range 1-30L/min

Perfect for what I needed. I was doing a project where I needed to calibrate a hall effect sensor. These were a nice stand in. Worked well, would recommend. Did not use it for a grow farm.

I can not even begin to explain what a poece of junk these are, i just dropped one, it shattered, i teflon taped the hell out of one,still felt loose in 1/2 pvc, taped it like crazy even more, and it had a pin point hole in the plastic , finally wrapped up with half a role of teflon tape my first gallon through it 1700 pulses, next one 800ish pulses, i tried it al one flaow rate not adjusting itnat all oi got 900 pulses, then did the exact same thing and got 1500pulses. I dont know why you would have a flow sensor like this . Tital junk, i asked grok about ut , it said I ts junk.

Really nice addition when replacing a water sensor in my tankless water heater. The old one was all black and you couldn't see what was going on inside the device. This one is clear and you can see the water moving and the device inside spinning. Wonderful now I can tell visually if it is working! The wires were too short for me so I soldered on some extra wire and covered the joint with heat srinkable tubing.

Developing some pool monitoring equipment. This was for my prototype. Worked great and the 300 pulses per liter is pretty close. Just be aware that signal wire is high and drops to low when a pulse is sent. Connected to an ESP32 and used a falling edge interrupt. got it to about 15 gal / min on a garden hose.

My application is on the lower side of it's secified flow range. So just abit above 1 l/m but it really doesn't work at that flow rate. The wheel constantly keeps stoppingeven though water is flowing constnatly. At higher flowr ates this might be ok but if you have anything close to the low end of the specified flow rate. Get something else.