Pipettes are critical laboratory instruments used to dispense accurate and precise volumes of liquids. They require regular calibration and maintenance to ensure reliable and consistent performance. Calibration should be performed at regular intervals, usually every six months or after a major repair or service. 

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Preventive maintenance is also essential for the proper functioning of pipettes. It involves regular cleaning, lubrication, and inspection of critical components. Lubrication is necessary to maintain smooth operation of the piston and prevent wear and tear of components. Inspecting the seals, o-rings, and other critical components for signs of damage or wear is essential to prevent leakage and ensure accurate dispensing. Regular maintenance not only prolongs the lifespan of pipettes but also improves their accuracy and precision, thereby ensuring reliable results.