I use the American Marine Pin Point monitor, and even though their product isn't advertised for continuous use, an email response from them said otherwise. I was told that you can run it continuously, but they recommend weekly calibration, and it can reduce the overall livespan of the probe.
I run mine both ways, I use it weekly to test, and when I do water changes I leave it in continuously for about 4 or 5 hours, just to watch the numbers.
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