Point your phone at your TV while it plays a flash-and-click test pattern. The tool listens with your microphone and watches with your camera, then measures the delay between the audio click and the visual flash — your A/V offset in milliseconds and millimeters.
Point this device at your TV while it plays a flash-and-click test pattern. Adjust settings below, then press Start Measuring.
Hold this device ~30 cm from a mirror with the rear camera facing the mirror. Aim at the top of the reflection for best accuracy — displays scan top to bottom. Press Calibrate, then keep still while 10 flashes run.
Use a disc or signal with a flash-and-click A/V sync pattern. The Spears & Munsil Benchmark includes this. The flash should be brief and bright; the click sharp and loud.
Enter your distance from the TV speakers so sound travel time is subtracted. Choose a measurement duration, then press Start Measuring and grant camera and microphone permissions.
Drag on the camera view to draw a box around the part of the screen where the flash appears. This reduces false triggers from ambient light changes.
Positive = audio ahead of picture (yellow). Negative = audio behind picture (blue). Within your threshold = synchronized (green). Delete bad readings by tapping them. Check the span to assess system stability.