NEN EN 352-7 : 2003

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Testing
6 Information supplied by the manufacturer
7 Marking
Annex A (informative) Uncertainty of measurement and
        interpretation of test results
Annex B (informative) Determination of criterion level
        for level-dependent ear-plugs
Annex ZA (informative) Clauses of this European standard
         addressing essential requirements or other
         provisions of EU Directive
Bibliography

Gives additional constructional, design and performance requirements, methods of test, marking requirements and user information relating to the incorporation of the level-dependency facility.