Avongard Standard Tell-Tale Crack Monitor Long Tape Hook for positioning a tape

Hook for positioning a tape measure directly below the tribrach

Combined with the stadia calculation of distances from staff readings the NAK2 circle adds the application benefit of detail survey work

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With inscription space for clear assignment of measurement points

Avongard Standard Tell-Tale Crack Monitor Long Tape Hook for positioning a tapeTell Tales are precision gauges uses to monitor movement of a crack, horizontal or vertically on a flat surface. The monitor that consist of two plates which overlap for a part of their length. The bottom plate is calibrated in millimeters and the top plate is transparent and marked with a hairline cursor in the form of a cross. The two pegs are removed. As the crack opens, or closes, the cursor moves relative to the calibration scale. The opening or