Portable hand-held COD meter designed to provide measurements for the most critical water quality parameter.

手持式COD仪表用于测试最重要的水质参数。

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Portable hand-held dissolved oxygen meter designed to provide measurements for the most critical water quality parameter.

便携式手持溶解氧仪设计提供了最重要的水质参数的测量。

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Depending on his or her age, your child may use a hand-held device to measure how well he or she can breathe (peak flow meter).

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