This practice is highly recommended if you are in an environment saturated with WiFi networks and other radio frequencies. For example stadiums, concert halls, and school campuses.
The following are links to some of the mentioned products in the video.
Fluke Networks Aircheck Tester - flukenetworks.com/enterprise-network/network-testing/AirCheck-Wi-Fi-Tester
WiFi Explorer - itunes.apple.com/us/app/wifi-explorer/id494803304?mt=12
inSSIDer - metageek.net/products/inssider/
Airport Extreme - apple.com/airportextreme/
Airport Utility - itunes.apple.com/us/app/airport-utility/id427276530?mt=8