Field instruments are used to measure various physical parameters like pressure, humidity, corrosion, temperature, flow, acceleration, velocity, displacement, etc. Depending on the type of measurement, there are different calibration techniques available.
Transducer calibration which focuses on the transducer input-output output relationship
Physical end-to-end calibration
Data system calibration which simulates or models the input of the entire measurement system
All these calibrations ensure that your device measurements are accurate which will positively affect your production process because all the measurements will be correct. This also reduces the variation with respect to the technical specification as well as help in preventive maintenance.