This spell allows the caster to identify a magical artefact, which must be done at least once before you can recharge an item of that type.

In addition, the spell is useful to those with no interest in recharging to determine the amount of charges remaining in any magical artefact, provided the caster has enough skill to determine it. If the spell reports a number of charges, then that number is correct. If the caster is unsure of the weave, it indicates that, at least on that attempt, the caster's skills were insufficient.

 

It can be used to keep an eye on critical artefacts such as blue crystal rings to ensure you do not run out at an inopportune time.