The Metering Room is a square building made of brick and ferroconcrete. Its function was to measure water volume.The walls of the building were decorated with fillisters and scores, its four corners had original red brick deliberately left revealed, and its windows and window frames were semicircular on the upper half and square on the lower half. It is speculated that this building was added after the completion of Taipei City's main waterworks; however, the facility still matches the overall plan and design. The original year and design of this structure is unknown due to the loss of files; it was retired from service metering the water output of Guanyinshan Distribution Reservoir in 1977 when the Gongguan Purification Plant was built.
Having undergone repair and renovation, the room is now a heritage site restaurant offering a variety of teas and simple meals.