I have one. I tested it against the high dollar meter at Seascape today and it read .08 when their meter said .087.
A couple of things for those who get one...
It comes with only 6 reagents so you might as well order more at the same time. 25 for 9 bucks from Premium Aquatics.
Also, and a big design flaw, or as some one said, a way for them to sell more reagent...You only get your reading for 10 seconds and its gone. Miss it and you will be doing the test over.
Even if its not as accurate as the 200 dollar meter, its much better than any test kit that I am aware of.
Julie