How is file grit measured?

File grit is measured by the number of abrasive particles per square inch, which indicates the coarseness or fineness of the file. Grit refers to the texture that determines how aggressive the file will be on the nails or skin. A higher number of particles per square inch results in a finer grit, which is suitable for smoothing or polishing. Conversely, files with fewer particles per square inch have a coarser texture, making them useful for shaping nails or removing bulk material.

This measurement method is crucial in the aesthetic industry as it helps professionals select the appropriate file for specific tasks, such as filing natural nails or acrylics. Proper understanding of file grit ensures effective and safe nail care, avoiding damage to the nail bed or surrounding skin. The other options do not accurately represent the standardized method of evaluating file grit, thus confirming the first option as correct.