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.
Corner Tell-Tale, Plus Tell-Tale and Displacement Tell-Tales are also available, please enquire for more details.