It’s pretty good. Am using it with ATI essentials plus 2 dose system rather then the xepta fluids, but KH seems stable. I see the daily pH fluctuations as well. Xepta measured KH higher than my Red Sea test, but I’m more concerned with stability than the actual nr.
The app is a bit crappy, but works ish. Updating firmware and connecting to WiFi could have been made much easier, but should only have to worry about that once

Ive set it at testing 4x a day. It’s odd that it keeps a 6hr interval between tests. So actual testing moves out by several minutes over time. Eg measure at 4am, test takes 5min then next test is 10.05am, then 4.10pm etc. Don’t know why they did it that way, but testing seems to be working fine

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