A) Tell-Tale Crack Meter
The system consists of two plates that overlap for part of their length. One plate is calibrated in millimeters and the overlapping plate is transparent and marked with a hairline cursor. As the crack width opens or closes, one plate moves relative to the other. The relationship of the cursor to the scale represents the amount of movement occurring. These gauges are monitored over time, whilst being kept as far away from human disturbance as possible, to develop an understanding in the width and direction of movement of the crack.
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| B) Crack Micro-scope |
| A simple hand held tool that aids in the identification of crack width. It comes in the form of a simple microscope with a lighting element. |
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