I put these three meters from the same manufacturer, China, in my control room.
The first picture showed that at 9 o'clock. The humidity are quite different.
But at noon at the same place, same day, the humidity are all the same!
It means that at high humidity, the accuracy of these hygrometer is not very good, but at low humidity, there are more reliable. For Bh with high humidity, be careful, better to use a good quality hygrometer.
Yesterday my partner installed our temp-humidity controller in our BH. This is a local made brand, work quite well.
The humidity reading is 3% different from the Korean one on the back, both are placed on the same floor but different spots.
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