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The CONVEX-D digital tape extensometer basically consists of a steel survey tape with punched holes, loaded on a reel fixed to the body of the instrument.

Among added features to the CONVEX-D, there is:

A unique anti-backlash tensioning mechanism ensuring a continuous accuracy in time.

A pivoting latch has been incorporated to lock positively the tape, thus facilitating the instrument’s handling.A digital indicator has been added in order to accurately read the relative change between two reference points. By turning the rotary protection drum, it is easy to get quick access to the digital display function buttons through the opening provided for this purpose.Two hooks are provided, one at the movable end of the tape and the other on the reel frame.