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Which domestic brand of airtightness testers can replace ATEQ and COSMO? An analysis based on first principles

This article outlines the selection criteria for choosing domestic air-tightness testers as alternatives to imported brands: resolution is not the same as accuracy, and repeatability is the key to mass production; It compares the publicly available specifications of ATEQ, COSMO, and JCGK Jingcheng Engineering, pointing out that error specifications from different sources cannot be directly compared, and provides a five-step verification method for comparative testing under identical conditions, along with a roadmap for pilot implementation and widespread adoption of domestic alternatives.