MSHA - Code of Federal Regulations - 30 CFR 77.1901-1
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MSHA - Title 30 CFR
30 CFR § 77.1901-1
Methane and oxygen deficiency tests; approved devices.

Tests for oxygen deficiency shall be made with a permissible flame safety lamp or other means approved by the Secretary, and tests for methane shall be made with a methane detector approved by the Secretary.