微粒过滤器应当包含差动压力表(或压力显示器)，借以说明何时应该更换过滤介质，当过滤器使用寿命到了也应当更换。
Particle filters should include (or pressure differential gauge display), so as to explain when should change the filter medium, when filter service life to also shall be replaced.
微粒过滤器应当包含差动压力表(或压力显示器)，借以说明何时应该更换过滤介质，当过滤器使用寿命到了也应当更换。
Particle filters should include (or pressure differential gauge display), so as to explain when should change the filter medium, when filter service life to also shall be replaced.
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