Avongard Standard Tell-Tale Crack Monitor Long Tape The clamps are designed to

The clamps are designed to fit a pole diameter of 1

8 cm) 1 Extra Long Sweep Arm

Hook for positioning a tape measure directly below the tribrach

With inscription space for clear assignment of measurement points

Includes Compass

Avongard Standard Tell-Tale Crack Monitor Long Tape The clamps are designed toTell 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