category: accessories
accessory is designed to verify the 卡塔尔世界杯中国足球赛事 accuracy (calibration) and new adjustment of instruments sensing the air relative humidity.
relative humidity is generated in air-tight vessel fixed to relative humidity probe. the value of relative humidity is depends on chemical solution applied inside of the vessel.
for use with humidity standards hm023 10% rh and hm024 80% rh.
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