Series gd direct read glass tube flowmeters, Rotating magnifying lens, 65 mm flowmeters - hydrogen – Key Instruments GD Series User Manual
Page 4: 150 mm flowmeters - hydrogen, 65 mm flowmeters - carbon dioxide, 150 mm flowmeters - carbon dioxide, 65 mm flowmeters - helium, 150 mm flowmeters - helium, 65 mm flowmeters - argon, 150 mm flowmeters - argon
