MS400: If you’ve got to test air channels then you’ve got to have one of these. The Manometer features a stainless steel needle and a graduated gauge..ms400如果你測空氣然后你有些。壓力用不、刻度..It has a valve stem air fitting and an on/off valve built in.它有一個桿空氣接頭和一個開/關內置。