Dew point measurement instruments are often used in applications, such as drying or general humidity control, where continuous accuracy brings both energy and cost efficiency. If you have a GxP environment that requires regulatory compliance, no other reasons to calibrate are really needed, but your product quality may depend on the highest possible accuracy also in other demanding environments. 

If you are drying products where certain humidity level of the final product is in an essential role, reliable data year after year will help you control the product quality. When it comes to drying applications, regular calibration will in most cases enable using the same measurement instrument for years. You will know the exact dew point temperature to control the temperature of the drying air.