Fill-in method when the analysis and testing results are zero in special operation management

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In the management of hot work and work in confined spaces, analysis and testing for toxic and flammable gases are involved. Under normal circumstances, when measures such as cleaning and purging as well as system isolation are carried out properly, the results of these analyses and tests are usually “zero”. So, how should it be filled in the test result section? Some experts have suggested that “undetectable” should be indicated, because a value of “0” does not mean that the substance in question is completely absent; it simply means that the testing equipment does not have the precision required to detect such small amounts. Therefore, “undetectable” should be the value used. Later, another expert saw this way of filling in the information and considered it incorrect; it should still be filled in as “0”, because a basic requirement for analysts is that test results must be expressed in numbers, and words cannot be used in place of numbers. What do people think is the correct way to fill it out? Explain the reason. Everyone has their own opinions, and there’s no need to be rude just because views differ; P