Not very precise at all

In the worst spots the graphs tends to be lower, and the better spots it tends to be higher, but youll get a lot of near equal heights whether youre behind the water heater or next to the airport extreme. I attached an extender base station near the "bad spots" in my house, and the graph still flucuated all over the place, with a few more highs. I called it a win.

If you want to map out your houses signal strength, this is useless. If you want a rough estimate, its okay.

mwalker about Wi-Fi SweetSpots, v1.5.2