A basic (and the original) calibrated Tell-Tale that monitors horizontal and vertical movement across a crack on a flat surface. The Tell-Tale is preset at zero with transparent tape. The tape is cut after the Tell-Tale is fixed across the crack.

Specifications:

Applications:

• 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 milli-metres 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 but available as accessories).
  
• Supplied with full instructions and Crack Record
  Sheet (Replacement Crack Record Sheets can be downloaded from here).