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- 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 but available as accessories).
- Supplied with full instructions and Crack Record
Sheet (Replacement Crack Record Sheets can be downloaded from here).
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Monitoring Cracks to +/- 1.0 mm accuracy |
As the crack opens, or if vertical movement occurs, 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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Monitoring Cracks to +/- 0.1 mm accuracy |
For more accurate monitoring, calipers can be used to measure the distances between the monitoring spigots. The distance between the spigots is then recorded on the crack record sheet supplied. |
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