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1·Hygrometry is the branch of applied science.

湿度测定法是应用科学的一个分支。

2·HM1500 is an exact sensor of hygrometry, it was designed by what make use of the HUMIREL company patented product HS1101.

HM 1500是一种精密湿度传感器。采用HUMIREL公司的专利湿敏电容hs1101设计制造。