A few of these things popping up the past couple years and each one has been virtually identical despite each proclaiming their uniqueness. Search for pHin or Sutro if you want the long discussions. The short answer is no, this thing isn't worth it. It measures temperature, pH, and ORP (which is supposed to be a chlorine reading). Temperature is fine, but not that important to track. ORP is unreliable, especially with CYA in the water. And pH is fine, though you will need to calibrate. These things are essentially a wifi thermometer with a $15 pH tester attached to it. So if it costs more than $20, hard pass.
My usual disclaimer is that I'm eagerly awaiting the day one of these things will reliable measure FC, pH, TA, and CYA (and preferably also CC and CH, but I don't want to get greedy) at a reasonable price. I will happily hang up my TF-100 on that day and buy a dozen of them. That day is not coming any time soon by the look of things.