When you calibrate and compare two instruments, they may give slightly different results. In this case it makes sense to adjust the instrument being tested to measure correctly. This process is often called adjustment or trimming.

Adjustment is the process of fine-tuning an instrument to make sure it gives accurate measurements. For example, if a thermometer consistently shows a slightly higher temperature than the actual reading, adjustment would involve correcting it so it displays the correct temperature.

Generally, calibration and adjustment are separate processes. People sometimes use “calibration” to also mean adjustment. However, calibration does not include adjustment and this is a process of its own.