Why throughput verification matters more than signal strength
Most Wi-Fi installation hand-overs end with the installer waving their phone at a 'signal strength' bar. That's a misleading metric. A device can show full bars and still get 50 Mbps because of co-channel interference, a noisy 2.4 GHz neighbour, or a misnegotiated MCS rate. Throughput is the only metric that reflects what the customer will experience. Running iPerf3 against a wired endpoint in the same property tells you whether the link is delivering what the AP spec promises. If it's not, you find out before the customer calls back. Signal strength is a survey tool; throughput is a verification tool. After the install, you want verification.
Validating 6 GHz, 5 GHz, and 2.4 GHz separately
Wi-Fi 6E and tri-band mesh systems blur the lines between bands. Devices roam between them automatically, which is great for the user but inconvenient for verification. To validate each band, force the test device to a specific SSID per band. Most installers temporarily configure 'Test-6', 'Test-5', 'Test-24' SSIDs and remove them after sign-off. Run iPerf3 in each room against each SSID. The pattern you'll often see: 6 GHz delivers 1.5 to 2.0 Gbps near the AP, falls off rapidly through walls; 5 GHz holds 400 to 700 Mbps room-to-room; 2.4 GHz survives at 80 to 150 Mbps almost anywhere. That triangulation tells you exactly where AP placement is correct and where it isn't.
Documenting the install for the customer
The single biggest source of post-install support tickets is 'I thought my Wi-Fi would be faster than this.' That conversation goes very differently when you can point to a CSV from the install day showing 940 Mbps in the lounge, 720 Mbps in the kitchen, 410 Mbps in the upstairs bedroom, and a note that the customer's device, not the network, is the bottleneck in the back office. Run the tests, export the CSV, attach to the invoice. The customer doesn't have to take your word for it; they have the data. For commercial installs, this also doubles as proof of completion for the contracted SOW.
