Model 644 Options:

  Flow Ranges:  L, M, H or XH

  Flow Ports:  3 Standard, 2 additional are optional

  Exit Flow, 1 Standard exit flow port, second port optional

  Part Pressure, 0-50 PSIG Standard, 0-50 Inches Water Column Optional

  CE Marking Optional, CSA Inspection Optional

  Optional Hardware:  Ink Jet Printer, Dot Matrix Printer, Dewpoint Meter, Bar Code Wand,

      Bar Code Pen Reader, Lock-out Box, Left or Right Hand Side Table, Low System

     Pressure Indicator Light