I stopped using this for awhile because I messed up my device and didn't have time to set everything up again (sump + electronics dunking incident).
Before I went on a 1 month vacation I set everything up again, and shockingly it's working fantastic. I need to retest myself, but the numbers I was getting while I was gone were very close to the numbers my neighbor pulled with my Hanna 2 or 3 times while I was away (I'm very lucky to have a helpful neighbor). I'm going to finally setup a second one of these on my main display.
It's now very easy to build one. I know where to order all the parts, and the setup is straightforward if you know how to crimp wires. pH probe calibration is the most annoying part, but I think I overly complicate that by trying to be too precise. It's mostly automated now, I just need to tune it some.
Also I realized right before I left that with this equipment I can also create a fully automated water change system. I'm probably going to set that up next. Same exact components, but I'll have the drain go to a bucket, the fill pull from a saltwater reservoir, and have one head leftover I can use for dosing.
