Tell-Tales are precision gauges that consist of two plates which overlap for a part of their length.
The basic Tell-Tale crack monitoring gauge that monitors horizontal and vertical movement across a crack on a flat surface to an accuracy of +/- 1.0mm and by interpolation to +/-0.5mm.
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 but available as accessories)
Supplied with full instructions and Crack Record Sheet
How to Use
The Tell-Tale is fixed across the crack using screws and plugs and/or adhesive. Then remove the 2 pins/plugs.
As the crack opens, or closes, the cursor moves relative to the calibration scale. The opening or closing of the crack is then recorded on the crack record sheet supplied.
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