Congo Imports of hydrometers, thermometers, pyrometers, barometers, hygrometers from Swaziland was US$670 during 2021, according to the United Nations COMTRADE database on international trade. Congo Imports of hydrometers, thermometers, pyrometers, barometers, hygrometers from Swaziland - data, historical chart and statistics - was last updated on May of 2024.