A small residual load may be displayed due to tolerances in the system. It is not possible to adjust this. This is irrelevant to the measurement...

A small residual load may be displayed due to tolerances in the system. It is not possible to adjust this. This is irrelevant to the measurement accuracy provided it is within the defined limits. An acceptable value for the load displayed on the screen with no load applied is:

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If the residual load displayed exceeds these values the instrument should be sent for servicing.