Powerlifters often aim to break records and achieve PRs. When a lifter knows that the weights they are using are accurate and standardized, it can boost their confidence.
Calibrated plates are made from metal which can be susceptible to scratches when they come into contact with hard or abrasive surfaces.
Color-coded plates make it easy for lifters to quickly identify the weight of each plate. This is particularly useful during competitions.
There are several brands that manufacture calibrated powerlifting plates. The choice of brand often depends on factors like budget, and use.