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Do you mean what is it for, or how to adjust it?

1. Analog multimeters operate by passing a current through a coil that "sits" in a magnetic field. Interaction between the current and the field deflects the coil, and the attached pointer. The moving coil is "restored" (set back to zero) by two springs - usually coiled hair springs.

The springs should bring the pointer exactly back to zero when the meter is not measuring anything, but ageing and shocks/bumps may alter the rest position (the zero) of the meter mechanism.

2. The zero adjustment is there to set the point back exactly to zero when no measurement is being taken. Be aware that setting the pointer to zero with the meter sitting flat on the bench *should* mean that it stays at zero if the meter is sat upright. If the meter does not retain zero, this is usually the result of cheap construction rather than any fault.

It's easy enough to reset the zero for different meter positions if the reading is critical.

Be aware that most multimeters don't specify any accuracy better than "a few" percent, so obsessing over the *exact* zero setting is rarely justified.

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