Yea Dave, you have to be careful with the Chinese Black Boxes, you'll cook shit quick with them. Mine are about 20ish cm off the water to get spread.
That'll be interesting to watch out for. Certainly haven't seen any significant swings - sensor is still within a few inches of my Seneye, and so far this one has been pretty good - certainly not seeing any variation greater than I was seeing with STC-1000s when I used them. Getting perhaps a half degree variation at times which isn't terribly significant; if anything it's a fraction high but it's easy enough to compensate for. The Seneye does all kinds of SMS and email alerts (on top of the monitor that sits beside my tank showing the current stats), so it's easy enough for me to keep an eye on it. Will certainly be a bit more curious about watching the temps though.The control issue with the Inkbird controllers was the reason I took mine out of service. I can't have 3 degree swings constantly in my rearing system, has to stay within 1 degree. The Inkbird controllers do an OK job, but I need a tad more of a narrow temp band.