What could cause the need for sensor calibration in RAWS?

The need for sensor calibration in RAWS can indeed arise from regular wear and tear of equipment. Over time, sensors can drift from their original calibration due to factors such as mechanical wear, exposure to environmental conditions, or the accumulation of residue on sensor surfaces. This drift can result in inaccurate measurements if not addressed. Regular calibration ensures that the sensors are operating within the required accuracy parameters, thus maintaining the reliability of the data gathered by the system.

Other factors could potentially necessitate sensor recalibration as well, such as extreme weather conditions which may impact sensor performance, software updates that alter operational parameters, or changes in battery type which might affect the power supply stability. However, among the options provided, regular wear and tear is a direct and consistent reason for recalibration, making it the most suitable choice in this context.