The ease for these tests isn't necessairly in preparing the tests. In fact, they're probably largely the same. But ease lies in the reading - most likely more accurate than judging colour by eye, and because they are most likely not titration-based, will allow for more precise readings. As well, it's repeatability - for the colorimiter, it's going to be fairly consistent day to day. For test kits, the result is only as consistent as your interpretation of the resultant colour.
Yeah to have probes to monitor it real tim would be great. Tied to my dosers, parameters would always be rock solid in a very small range, and you'd just have to recalibrate once in a while as opposed to testing a here and there.
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