Has anyone used one of these?

No I haven't used that one, but we use a couple of other Hanna Instrument testers for testing the water from our private sevage treatment system. They seem quite basic and easy to use and work ok for that purpose.
 
I just used it for the first time. Very cool...like the Speed Stirrer.
Where it helps me is if my pH drifts to 7.8 and anywhere beyond, I couldn't really tell by color exactly how high it was. I never knew how much Muriatic Acid I needed to add the get back to my target.
This thing gives you a reading to 1/100 of a point.
 
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