TC21 - AVONGARD Corner Tell-Tale - Crack Monitor

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AVONGARD - TC21 Corner Tell-tale 

The Avongard Corner Tell-Tale monitors horizontal and vertical movement across a crack in a corner.

  • The Tell-Tale is hinged enabling it to be used in internal corners of angles between 70 and 180 degrees.
  • Monitors both internal and external corners.
  • Avongard Tell-Tales are precision gauges that consist of two plates which overlap for a part of their length. The bottom plate is calibrated in millimetres and the top plate is transparent and marked with a hairline cursor in the form of a cross.
  • Fix using Screws and Adhesive (not included).
  • Supplied with full instructions and Crack Record Sheet.
  • Weather-resistant.


Product Specification:

Application:               Monitoring of crack displacement on concrete or walled structures.

Range:                       ± 25 mm horizontal and ± 10 mm vertical.

Accuracy:                   ±1.0 mm on scale

Temperature:            -40 to +80 degrees C.

The coefficient of thermal expansion is 6.8 x 10-5 cm/cm per degree C.