Oscium’s WiPry-Pro can visualize Wi-Fi signals on an iPhone or an iPad in a number of different ways. Here are a couple of common techniques that are used to quantify and measure signal strength: (1) real wave view and (2) table view.
(1) Real Wave View
The signal strength of the AP Hebel_2.4 is -45.43 dBm. This image was taken using an iPhone 5.
(2) Table View
The signal strength of the Wi-Fi hotspot xfinitywifi is -44 dBm. This image was also taken on an iPhone 5.