A whiteboard for RF design
Sequence plates replay a conversation; this lab hands you a floor and the access points to cover it. Add or remove APs, drag them anywhere, switch each one between 2.4 and 5 GHz, cycle its channel, and slide its power up or down. Same-channel cells that overlap light up red — that clash is the slowdown people blame on 'bad Wi-Fi'.
A draggable client measures what it hears from every AP, ranked by signal, and sticks to its current AP until a rival beats it by the roaming threshold — exactly how a real device behaves.