Tonga Exports of hydrometers, thermometers, pyrometers, barometers, hygrometers to Germany was US$1.11 Thousand during 2014, according to the United Nations COMTRADE database on international trade. Tonga Exports of hydrometers, thermometers, pyrometers, barometers, hygrometers to Germany - data, historical chart and statistics - was last updated on May of 2024.