An authentic vintage German laboratory inclined tube manometer (draft gauge) manufactured by Werkstätten für Feinmechanik Georg Rosenmüller, Dresden N.6. Mounted on its original solid wooden base ( 30×23×5 cm), featuring intact blown-glass tubes, a precision brass scale (mm WS), integrated spirit level, original rubber connectors, and standard metal mounting brackets. Includes original maker's plaque and fluid calibration plate (Füllflüssigkeit spec. Gewicht: 0,8 gr/ccm, Serial No. 42729). In excellent, clean collector's condition with beautiful age-appropriate patina.