What are the merits of using a pipette accuracy tester? (How is it different from managing the output volume as a mass (in grams) using a regular balance?) [Pipette Accuracy Testers]

A balance outputs a mass (mg) while a pipette is managed by volume (μL). Since the pipette accuracy tester converts mass to volume, it can check the volume required for the pipette. Furthermore, it can accurately measure without concern for evaporation because of its evaporation trap. Finally, it can confirm that the specified volume and the output volume match (accuracy and repeatability).