I personally haven't ever even seen one in person but everything I've read here sez they are JUNK. Apparently they really don't monitor in the true sense of the word. they must be calibrated before each reading according to what I've read. I haven't seen any positive feedback anywhere. And, they seem really expensive for something that doesn't work! HTH.
Go use the search and narrow it to the chemistry forum. It seems they aren't the consistency and reliability of the other monitors. Sounds great in theory but apparently they aren't.
Used one for about a week. Works great if you can calibrate frequently and change the probe every so often. I went back to good old testing which seemed easier than the finicky monitor.HTH
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