Inter-Laboratory Proficiency Testing Comparison or 6.3 (PT)A laboratory test to check the authorities by joining make Comparison or Proficiency Testing Inter-Laboratory (PT) at least once a year, in the scope of the tests that have been certified according to ISO/IEC ability 17025 by testing with the authority that is recognized in the national or international level, to ensure that the test personnel have the ability to perform tests that are responsible.
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