Video Signal Input Lag Tester

Price: 74.99GBP

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A device used to measure the delay (latency) in which it takes a video signal to pass from the point of input until it is displayed on a television, monitor or projector screen. Commonly known as input lag, this delay can be a cause of many problems for users in many different fields, from the average home gamer to public displays and even specialised areas such the medical profession. Click here for info on display lag.

Read more on input lag and a review of our tester in this article by CNET here:-

CNET Input Lag Article and Leo Bodnar LagTester Review

- Portable design.

- Very simple to use.

- Standalone hardware device.

- Provides accurate measurement within 1 millisecond accuracy.

- Powered by two AA batteries (supplied)

- Measures combined input lag and pixel response time.

- Works with Plasma, LCD, LED, OLED TVs, monitors and projectors.

- Very small and convenient to fit in your pocket!

Connection to Screen or Projector

The device features a standard HDMI connector on the bottom. You can use any standard HDMI cable or HDMI to DVI.


Output Connector


Output Resolution

1920x1080 or 1280x720

Output Frequency


Power Requirements

2x AA 1.5v batteries

Housing Material



100g (excluding batteries)

Dimensions (LxWxH)

118x79x31 mm

LCD/LED Screens
Results will vary between the three reference marks on an LCD/LED screen. This is due to the way the screen is updated, generally starting from the top and ending at the bottom. The minimum result possible at the bottom of the screen should be 16ms (t = 1 / f = 1 / (60 Hz) = 16.67 ms). We recommend using the middle reference mark for recording results.

Plasma Screens
Each frame is displayed synchronously on a plasma screen so the results on all three reference bars should be equal.

When using a projector simply turn the device around so that the photo sensor on the back of the device is positioned inside one of the displayed reference marks. We recommend using the middle reference mark for recording results.

Fluctuating Results
This can be caused by a timing difference in the back light and screen refresh rate. In this instance we recommend using the lowest value. For best results we also recommend setting the screen to the highest brightness and reduce ambient lighting where possible to ensure the most accurate readings.

Proudly designed and made in the UK.

1. Plug an HDMI lead into the TV and Lag Test device. (HDMI to DVI cable may also be used.)

2. After selecting the correct input on the TV or screen (refer to manufacturer handbook) hold down the button and wait a moment for test screen to appear.

3. Place device on the screen so that the photosensor is facing over one of the three displayed reference marks.

4. Read measurement result from the screen.