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THERMO-HYGROGRAPHY. To record the temperature and relative humidity of the environment, white lacquered aluminum case with Macrolon protection, aged bimetal for temperature and hair harp for humidity, temperature tolerance ±1.5%, relative humidity ±2.5% , temperature range -20/+60C, with electronic quartz mechanism, with lever selectable for weekly or daily, can also be supplied monthly, supplied with 100 sheets of recording paper and 2 spare nibs. ?