A Tell-Tale that monitors displacement and horizontal movement where there is a 'step' across a crack due to displacement or 'out of plane' movement.
• Displacement monitoring range to 110mm.
• Horizontal monitoring range of -10mm to +50mm.
• Calibrated in millimetres.
Note: The graduated ruler is not left in position. It is only used for taking readings. When not in use it can be kept with the record sheet. This avoids projections which are liable to be damaged during the monitoring period.
