DIGITEN Water Flow Control LCD Display+1/2" Flow Sensor Meter+1/2" Solenoid Valve+12V Power

I've been wanting a water flow meter with solenoid for a while for my beer brewing, but I couldn't find something within my price range with good reviews and in gallons until this unit became available (I've been looking for years).This was easy enough to put together and setup. I had to use a number of 1/2" NPT couplers since all the fittings here are male (it would've been more convenient if the solenoid was female NPT on both sides for me). It took me about half an hour to calibrate the k constant for my flow rate and fittings. I was able to get it to within 1.5 ounces by weight for a gallon - I calibrated with a gallon milk jug first to get it close, and then I fine tuned it on a scale knowing the density of a gallon of water.The solenoid is honestly of dubious long term quality, but I plan on buying a higher quality one to keep on hand, and I hope it does last a long time.One nit pick for my system at least, is that the temperature probe uses an M8 threading, and given that the fittings are NPT, it doesn't quite make sense to me. I decided to use a 1/2" NPT plug, drill out the end, and then I bought M8 taps and tapped it myself to make a bushing so that I could measure the temperature. It did end up working well, but it would've been nicer to have a 1/4" NPT or 1/8" NPT for this.I've only used it for brewing twice, but it worked exactly as expected, and I actuated the solenoid numerous times while calibrating as well.It would've been nicer if the power supply were rated for greater than 2A since the controller can ouput up to 5A to a solenoid, but that isn't that big of a deal, I can either get a higher rated power supply or go with a separate SSR.

Works great. Delivers a measured amount of water each time. Only complaint I have is the button needs to be pushed twice each time instead of just once. It has a very short time period where if you dont push the button it goes back to sleep mode. Then you have to push the button to wake it up and again to deliver water.

Well it reads flow and volume (metric) and does turn on and off with control panel. You will need LOTS of Teflon tape. Rule of thumb is plastic to plastic threads need not be taped. But these you will need some tape and them some. The connections can't be actual 1/2" due to how much they leaked. Still now if have to much pressure it will still even leak.

Tried to calibrate the controller via adjustment of k-value. At k=7.49 controller dispences 9.3 liters instead of preset 10 (or -7%), at k=7.50 it dispences 10.9 liters instead of preset 10 (or +9%). I guess correct k-value should be around 7.494, but controller does not allow such fine adjustment.