How should a micrometer be stored to ensure its longevity?

Storing a micrometer with a gap between the spindle and the anvil is important for maintaining its precision and longevity. When the spindle and anvil are in contact, it can lead to potential deformation or wear over time, especially if the micrometer is subjected to vibrations or impacts. By keeping a gap, you ensure that delicate measuring surfaces remain free from damage and wear, which can affect the accuracy of measurements.

Additionally, it's worth noting that storing a micrometer in a controlled environment, like a closed container, helps protect it from dust, moisture, and other environmental factors, but the gap between the spindle and anvil specifically addresses the integrity of the measuring mechanism. Other methods of storage, like vertical positioning, do not directly impact how much wear the micrometer could experience from contact pressure.