Quality scale refers to the standard that is used to measure the quality of a product or service. However, several synonyms can be used to describe it, including quality rating, grade, level, benchmark, or standard. A quality rating is a measure of how well a product or service meets a set of pre-defined criteria. Grade refers to the level of excellence that a product or service has attained. A level is a degree of attainment that a product or service has achieved. A benchmark is a standard used to measure the quality of a product or service. Lastly, a standard is a defined level of excellence or performance that a product or service must meet to be considered high quality.