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Monitor crack movement robustly and easily!


Moiré Tell Tale crack monitors are used for measuring movement between two items, typically between two sides of a crack. 


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  • Detect and measure movements of less than 0.1mm.
  • Record long term or dynamic movement using a standard still or video camera or mobile phone.
  • See at a glance whether movement has occurred.
  • Record from large distances: tens of metres with a telephoto lens, hundreds with a telescope adaptor.
  • Easily measure movements in two directions.
  • Easy to fix using off-the-shelf gap filling adhesive.
“The tell-tale immediately gave useful results. A 0.3 mm displacement took place over 9 seconds. This rate of movement simply cannot be observed with the naked eye and is difficult to detect (and un-quantifiable) by touch.”
John Collins, Arup on behalf of the Humber Bridge Board
“Your Moiré Tell-Tales are brilliant! I have used them now for 2 years and have nothing but praise for their simplicity and ease of reading. The client is able to read the Tell-Tale and photograph it on a mobile and send me the photo cutting lots of running around. As usual the best ideas are the simplest! Thank you for making my life a little easier.”
Andy Banks MRICS MFPWS, Right Surveyors North East Ltd.