SeeedStudio流水量センサ（3/4 "）

This is an inexpensive and effective flow sensor. I would like to draw attention to the pipe fittings on it however. These are not customary NPT fittings used in North America but ISO-228 fittings commonly used everywhere else in the world. Finding compatible fittings in North America can be tricky. For the G3/4 threads on this sensor, I have found that the fittings on North American 3/4-inch flexible hot water tank hoses fit well.

Received several as described, plumber installed without leaks. Tested at low flow speeds, sends pulses. Only approximate when trying to measure volume. Only regret is that the output signal can stop at either high or low when flow ends.