At the risk of being beaten senseless with everyone's TF-100 test kit boxes, I was wondering -- anyone try the ePool wireless chemical monitoring system that Leslie's sells? I'm not looking for it as a test kit replacement, or something to tell my how much acid to add. More as a wireless temperature gauge with a Chlorine/pH indicator that warns me it's time to go test the water with my kit. Anyone try it? How far off from a TF-100 FC and pH measurement is it typically?