I've seen them from $10 to over $100. Anybody use the lower priced ones and are they any good? Just started running kalk and want to keep an eye on Ph, without having to break out the salifert test kit all the time. I like the idea of just dipping and getting a reading or if there is something available that constantly monitors Ph without going the Neptune route.
. There are stand-alone continuous ph monitors, (pinpoint is one that comes to mind), but they are a few $$

