Over recent years , the measurements demanded by P & S industries have gone from parts-per-million to partsper-billion levels , and our gas analysis technology has kept pace . Leading semiconductor companies are now looking for parts-per-trillion level impurities , a requirement that continues to drive technological change in gas analysis . Our SERVOPRO ULTRA Series of impurity measurement gas analyzers deliver industrybest lower detection limits for a range of contaminants , to meet the needs of UHP gas customers .
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