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old manometer ges-2 cultural center moscow redesigned water power exhibited plant russia soviet device measure physics zero arrow kgf kilogramm force square kilo kilopond scale blue turquoise object exhibit museum pressure 1991 russian indicate indicator metric system digits numbers decommissioned defunct technical atmosphere gauge measurement gage unit atmospheric precision instrument liquid calibration face ussr vintage not working show analog accurate wet meter graduation value energy hydroelectricity disused unused non functioning obsolete retro science scientific measuring precise decimal degree hydrostatic balance