Tension Correction
A tape is designed to be used with a specific amount of tension applied to it. If the correct tension for the tape is not applied, the following correction should be used.

Taking L as the measured length, Tf as the tension applied in the field, Ts as the standard tension (as stamped on the tape), A as the cross-sectional area of the steel, and E as the young's modulous of the tape, then:-

Correction = L (Tf - Ts) / (AE)

This value should then be added to the measured ground distance.

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