Video Signal Input Lag Tester


Please Choose:

Unit Price: 70.00GBP

Add to Cart:

Product Information

 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 the medical profession. Click here for info on display lag.

  • Portable design.

  • Very simple to use.

  • Standalone hardware device.

  • Provides accuratemeasurement with better than 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.

  • Designed and manufactured in Great Britain


Output Connector


Output Resolution

1980x1080 or 1280x720

Output Frequency


Power Requirements

2x AA 1.5v batteries

Housing Material



100g (excluding batteries)

Dimensions (LxWxH)

118x79x31 mm


Directions for use  

  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.


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.

Note:Standard resolution output is 1080p @ 60Hz. We have found through our own basic testing that the input lag does not appear to change regardless of the output resolution however some customers have requested they would like the device to output 720p to test screens for PS3 or Xbox360 usage. If you require 720p please select it from the drop down menu below. The device at present can only be programmed by ourselves so if you require a change in resolution you can return it to us and we will do this free of charge.