Tell Tale Crack Meters consist of two plates which 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. Range ±20 mm – Resolution 1 mm. The tell-tales are fixed with screws and adhesive across the crack to be monitored.
- Simple to read.
- Easy installation.
- Low cost.
- Used for the measuring widths of active cracks.
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