Which factor affects the calibration interval of precision instruments?

The calibration interval of precision instruments is significantly influenced by the environment in which they are used. Environmental factors such as temperature, humidity, and the presence of dust or corrosive substances can affect the performance and accuracy of instruments. If instruments are exposed to harsh conditions, they may drift from their calibrated settings more quickly, necessitating more frequent calibration to ensure that they maintain their accuracy and reliability.

For instance, an instrument used in a laboratory with stable, controlled conditions may require calibration less frequently than one used in a fluctuating or extreme environment. While personal preferences, cost, and age could play roles in decision-making regarding calibration, they do not directly impact the fundamental need for calibration based on how and where the instrument is used.