"JJF 1681-2017 Outline for Type Evaluation of Sound Level Meters" is applicable to sound level meters and is mainly used for type evaluation of equipment with classification code 28060500. This Outline refers to a number of national and international standards including sound calibrators, laboratory standard microphones and electromagnetic compatibility test methods. Sound level meters are used for sound pressure levels in measurement environments to evaluate Noise levels. The Outline details the composition and Measurement principles of sound level meters, covers key terms and definitions for Acoustic Measurement, ensuring accuracy and Reliability of measurement results. The cited document ensures compliance with the latest technical requirements and measurement standards according to its standard version.