Hong Kong Exports of hydrometers, thermometers, pyrometers, barometers, hygrometers to Spain was US$1.17 Million during 2021, according to the United Nations COMTRADE database on international trade. Hong Kong Exports of hydrometers, thermometers, pyrometers, barometers, hygrometers to Spain - data, historical chart and statistics - was last updated on May of 2024.