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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Sep 16, 2025
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Title 49
Chapter III
Part 325
Subpart C - Subpart C—Instrumentation
§ 325.21 - Scope of the rules in this subpart.
§ 325.23 - Type of measurement systems which may be used.
§ 325.25 - Calibration of measurement systems.
§ 325.27 - Use of a windscreen.
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