-8量級的標準漏孔(氦氣)
國家標準計量單位計量并出具檢定證書
檢漏儀漏率的檢測標準
標準漏孔可分:內置、外置。
-8 magnitude standard leak holes (He)
National Standard Unit of Measurement and Certification
Standard for Detecting Leakage Rate of Leak Detector
Standard leak can be divided into: built-in, external.