question: Why does a mass spectrometer need to be used with gauge to be accurate at high vacuum gas measurement ?
answer: composition of gases at high vacuums will usually be unpredictable
turker_answer: A mass spectrometer need to be used with gauge to be accurate at high vacuum gas measurement because composition of gases at high vacuums will usually be unpredictable .
rule-based: A mass spectrometer needs to be used with gauge to be accurate at high vacuum gas measurement because composition of gases at high vacuums will usually be unpredictable .