Quiz grid · Buzzer measurement
Buzzer measurement
This page measures how quickly the Wi-Fi in the room delivers signals. There are no points and no name is stored, only times and the type of device (iOS, Android, other).
Please keep the page open and the screen on.
The screen does not stay on by itself. Please switch off auto-lock for a moment (iPhone: Settings › Display & Brightness › Auto-Lock; Android: Settings › Display › Screen timeout).
0 devices are measuring
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How it works: everyone opens the QR code and taps “Measure”. Wait a few minutes, then send 10 to 20 signals a few seconds apart; everyone presses as soon as “Now” appears.
What is measured is how much a phone’s clock sync varies from one time to the next, not whether its clock is right: if the way there and back in the Wi-Fi is persistently of different length, a constant error stays invisible. The reaction time counts from the arrival of the signal and includes the short query until the button appears.
Devices
| Device | Type | Syncs | Round trip (median) | Clock (95 %) | Presses | last |
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